Suggestion about Korea's NIs and ingame features [Photos fixed]

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Dear paradox interactive!

I am Silicon, the user who is in the temporary charge of representating Korean paradox gaming community. As a Korean, I was delighted to hear the news that the developers will be focusing in East Asia with the 1.29 free update. The Korean community is very thrilled about this news, because they was convinced that Paradox would never release another free update or DLC about Far East and Korea after the release of Mandate of Heaven DLC in 2017. Korea in the game is overlooked as a region and a country. Of course, Korea did not historically pursue any major expansion compared to other nations, we are not asking for you to make it a giant military blob. However, the harshly nerfed development of Korea (Tibet superregion has more development than Korea. But it is quite understandable why you did so, since Korea tends to munch out Manchuria) and terrible, weak, historically inappropriate composition of the Korean ideas were controversial in Korean gaming community. Even if nerfing Korea and buffing Manchus was decided by game design and development direction, Manchuria was still too weak against Korea, due to geopolitical features of Korea and Manchuria in the game. So we propose an amendment to current EUIV's Korea. Before that, we are not saying that you have to buff Korea without any reason to do so and make it a superpower. We are just proposing the new, unique, revised Korean ideas, which have strong historical evidences and will lead to more enjoyable (and historically more accurate) gameplay experience for Korea.

The following proposals are suggestions from the Korean community. They are mostly about the easily changeable or very important features. By the way, we were extremely careful for writing this, since we do not know how much time and resources you will put in this new patch. Also, we wanted to enclose some historical evidences, but there was almost no evidences which are translated into English, so all we could've done was attaching some links to Wikipedia. Although we have a lot more ideas on Korea, we thought that it would be inappropriate for us to ask you fix every single features of Korea. This is our ideal revising plan for Korea in EUIV. Please let me/us know if you are going to add more events or decisions for Korea. We will always gladly help.


1. Korean ideas

We have heard your plans to change Korean National Ideas in future. We are going to point out inappropriate ideas, and propose alternative ideas to help the developer’s plan. Korean NI was nothing but dull, plain one like the Generic NI. In fact, some of the ideas were so bizarre and uncharacteristic that makes the Korean community quite upset.

The most of these ideas are not really connected well with their effects, and some ideas seem like the simple copies from Generic ideas. We considered these two points as the huge problems.

Also, there are some historical inaccuracies. For example, Geobukseon giving only +5% Ship durability (While Japanese idea gives them +10%. However, Korean battleships had overwhelming firepower and durability compared to the Japanese battleships. It was proven in the battle records during the Imjin war), and The Hangul Alphabet giving only -5% tech cost (While Manchurian alphabet gives -10%. However the Manchurian alphabet "and language" died out "at the end of the Qing dynasty," while Hangul is still being "used to this day)". “Of course we can understand that you have made it so weak for balancing”. However we think that you should have at least given it characteristics, instead of just making it backward compatible, weak and dull.

[Korean Traditions]

First of all, we couldn't understand why and how Korea received −10% Construction cost & +25% Domestic trade power. Rather than this, we wanted to propose new historically accurate Korean traditions.

+% Fire Damage

Historically, the ranged weaponry practices of Korean kingdoms was considered as one of the best in the East Asia. From the beginning of their history, Koreans valued archery to defend their territory against outside invaders. Even the state examination included archery to recruit ranking officials.
Koreans excelled not only in archery but also in gunnery with handcannons, matchlock muskets and cannons. Especially during the Joseon period, the armies of Korean kingdoms had large proportion of archers and gunners. For example, Koreans developed their own small arms like Chong-tong before the matchlocks.

1568219599.png


In addition, majority of the infantry equipped the matchlocks to repel Manchurian cavalry during the later stage of Joseon dynasty. Korea mass-produced matchlock guns and heavy cannons even after Qing dynasty and Tokugawa shogunate started banning personal small arms like matchlocks for various reasons, mainly political.



Attrition for enemies

https://en.wikipedia.org/wiki/Righteous_army

The Koreans are known for eagerly defending their homelands as guerillas. They are called 'Righteous armies'(Uibyeong), sometimes called as irregular armies or militias. They were informal civilian militias that have appeared several times in Korean history, when the national armies were in need of assistance. The first righteous armies emerged during the Khitan invasions of Korea and the Mongol invasions of Korea. They subsequently rose up during the Japanese invasions of Korea (1592–1598), the first and second Manchu invasions, and during the Japanese occupation and preceding events.

[Korean ambitions]

The current ambition gives Korea +10% infantry combat ability, but this is not historically correct. Korean infantries were famous for their ranged weapon skill, not their melee skill. For the new ambition of Korea, there are two suggestions. First suggestion is yearly harmony increase (since Korea was a Confucian state), and second one is +1 ruler admin skill (based on Confucian philosopher kings of Korea).

https://ko.wikipedia.org/wiki/경연

Because Confucius suggested Philosopher-king theory, Kings of Joseon dynasty had to spend most of their lifetime in studying, and debating with the government officials on matters of state. This is called 'Kyeong-yeon'. In the debates, the kings should convince their government officials with kings’ knowledge or they would be considered illegible as a monarch.

[New Korean ideas]

From now on, i will introduce some of the new ideas we've came up with which we thought they are good enough to replace some of the current NIs.

Hwacha or Bigeok-JinCholle(화차 or 비격전천뢰A sort of time-fused explosive mortar cannon)
+% Artillery combat ability

https://en.wikipedia.org/wiki/Hwacha

1568219599.jpg



Since the late Goryeo Dynasty(invented first Korean artillery piece in approx. 1370), the Koreans developed many gunpowder weapons and put effort in improving them significantly. Hostile Jurchens, Wakou pirates, and newly-established Ming dynasty in China forced Joseon dynasty to develop more powerful, more long-ranged artillery pieces. They needed some kind of 'Korean Wunderwaffe' to defend themselves from threats. Most notably Hwacha (화차), and Singijeon(신기전, rocket propelled heavy arrows) was developed to deal massive shock damage to the masses of enemies, and eventually drive them out.

1568219599 (1).jpg





https://www.reddit.com/r/MilitaryPo...dieval_antiship_missiles_daejanggunjeon_대장군전/


Other various weapons like Daejang-gunjeon(대장군전, loaded with missile-shaped projectile to pierce through enemy naval vessel's hull), and Bigyeok-jincheonloe(비격전천뢰) were also used to defend Korea from outside invaders. These two latter weapons proved their power during Imjin war.



1568219599 (2).jpg







https://ko.wikipedia.org/wiki/비격진천뢰

Sanseong(Mountain fortress, 산성)
+% Fort defence

https://en.wikipedia.org/wiki/Battle_of_Haengju

Many mountain fortresses, called Sanseong(산성) were constructed since the three kingdoms period of Korea, for various reasons, mainly for settlement defence and maintenance of national territories. Unlike normal castles which were built on flat ground, these forts provided immense defence capabilities and advantages to the defenders. Advantage in heights and carefully placed gunpowder weapons made it so difficult to capture or even besiege them for the outside invaders.

Ginseng trade (인삼 무역)
+% Trade eff. or Goods Produced Modifier.

http://www.culturecontent.com/conte...&content_id=cp030103360001&search_left_menu=2



http://www.culturecontent.com/conte...&content_id=cp030104220001&search_left_menu=2

Korean Ginsengs were considered a very rare commodity amongst East Asian nobility. Especially the Chinese nobles, favoured Korean Ginseng over Chinese ones due to their greater efficacy and quality compared to the Chinese ones. This special herb attracted large amount of silver from Japan(The Japanese even minted special silver coins in order to pay the price of Ginseng) as well as influx of trade from Chinese. Some Korean envoys to China even brought some Korean Ginseng to pay their journey in China as well.

Sam-sa

yearly corruption reduction



Sam-sa was a complex of government offices combining following three; Saheon-bu(supervision inspection & discipline control), Sagan-won(debating the king on matters of state, revoking faulty decrees, examine and sign a document in agreement with the appointment of a civil affairs official or the revision or abolition of a law), Hongmun-gwan(overseeing Kyeong-yeon, document management and advisoring the king). The role of Sam-sa was to check the tyranny caused by the king's excessive exercise of power, and to prevent or criticize the tyranny if it was carried out with high authority. It also carried out criticism of corrupt officials and calls for impeachment. They had a unique sense of professionalism, even when they were fired, they treated it as a kind of vacation, and they were not dismissed of their careers. The officials of Sam-sa felt it was a shame to fill their terms and they considered being dismissed rather an honor.



Amhaeng-eosa
yearly corruption reduction



The Amhaeng-eosa, or the Secret royal inspector, were undercover agents directly appointed by the king sent out to local provinces to monitor government agents under the guise of a civilian and were authorized to root out corrupt officials and arrest them. As the effects overlap with the View attachment 511861, you may choose whichever one that will suit better.

2. Measures to prevent Korea Megablob

No matter how much you nerf Korea's development and ideas, it will never be a fundamental solution to stop an AI Korea conquering the disunited Manchurian tribes and therby preventing the rise of Qing. We suggest a new method, based on historic evidences. Korea was trusted by Ming dynasty as a foremost tributary state and was given a lion's share of prestige in its interactions, but the Chinese have traditionally view their eastern neighbors with caution. A nation based in Korean peninsula with much population and military power was an existential potential threat to Beijing, where the Empire's capital sat. Thus, Ming tried to prevent Korea from expanding into Manchuria and vigilantly controlled its influence in the region by embargoing the strategic resources and such. This is why Korea waged many preventive war against the Jurchen without being able to take Manchuria itself, and did not expand beyond its natural borders as a result.

We propose a recurring event (perhaps 1470 ~ 1500?) where upon Korea conquering a province in Machuria the Ming will demand they return the province or risk lowering the trust between two nations and ultimately wage war against Korea. Of coruse, this proposal should also be followed with unlocking the Ming intervention earlier if Korea possesses more developments, enact certain decisions or complete the missions (as to differentiate the players and AI). Through the above suggestion, we beleive that Manchuria will be protected for a while without nerfing Korea through insufficient NI or development.

3. Various other issues

Aside from Korea, many other East Asian countries have one serious problem. Due to the nature of EU4's diplomacy, there are cases where the ruling dynasty changes after a royal marriage between two nations. However, this function was originally implemented to portray a personal union between European countries, which means East Asian countries do not get a personal union or get to maintain their ruling dynasty.

For Europe, this change of dynasty was a more accetable practice. For the East, the royalty was far more important to the country itself. A change in the ruling dynsaty meant that the mandate was lost, and therefore a new country was established. On this matter you previously replied "get an heir of your dynasty through royal marriage" when it was pointed out. We believe that you have a different, and quite frankly incorrect, understanding on this issue. A country was not passed through the succession laws or Christian traditions of God-given right as Europe did- a country was effectively a collective of people who, in their basic form, had some basic concept of right to choose a nation and its ruling family. The nobility were not an exception to a rule, and when the country failed people were allowed to rebel (and occasionally result in a new dynasty being established, see Red Turban Rebellion of Transition from Ming to Qing). Moreover, with the concept of a foreign barbarian being more prevalent in each countries, royal marriage between countries did not happen as it did in Europe. For China, there were none that would (or should, in their mind) challenge the middle kingdom in a spurious manner of a 'marriage scandal.' Same idea spread to Korea and Japan, where after centralization and a period of certain autonomy sending a royalty to foreign lands for marraige was considered seditious at best. From what we understand a few government forms (such as the shogunate for Ashikaga) have special mechanic which fixes their dynasty. As East Asian countries cannot have a personal union, it would be preferable to have this option as well.

http://nationalatlas.ngii.go.kr/pages/page_102.php#prettyPhoto

On a side note, you seem to have mistaken the geographic areas of Korea in its southern provinces of Naju and Sangju as highlands. The highlands Paradox developments have described are lands of high altitude without trees. Korea is filled with trees and mountains, but not as tall and treacherous as Alps (4808m) or Kunlun mountains (7167m). At best, Mount Baekdu is 2749m. As you can see in the map, Naju and Sangju were vast farmlands known for being breadbaskets with low altitude. ideally, we suggest you change these provinces to farmlands or plains.


4. Trade Node suggestions

http://contents.nahf.or.kr/item/item.do?levelId=edeah.d_0004_0020_0030_0020

Korea's trade node originally split in three directions but after MoH patch it was assigned to Nippon trade node. But this would be incorrect. Historically, the silver mine of Iwami produced silver which flowed from Japan to Korea and eventually to China. Korean products such as Ginseng, Paper and Chinaware were sold to China and Japan alike. The silver from Japan were transported to Korea and then used to buy Chinese silk. Of course, the trade nodes were not designed in game to simply represent the flow of coinage metals but the current trade node design does not justify the reasons (even if it was done to avoid trade company regions). We initially thought that suggesting a new trade node would be too much to ask for, but after seeing the Valencia node being divided from Genoa node decided to raise our voice on this matter. Please split the Nippon trade node to create a new node for Korea, titled "Hanseong." The trade flow from Nippon node should go to China and Hanseong, and Hanseong node should flow to China while receiving from the Girin node (as the trade did happen frequently between the numerous Jurchen tribes and the Kingdom of Korea).

5. Some unique Korean features, which developers might be interested of.

Korean game players always had a lot of interest about their country in the EU 4. As a result, they implemented various mods or built paper plans about Korean game plays. There are some examples:

1568219645.jpg
1568219645.png


We are just asking the developers to take a glance at it, rather than be serious about it. We think that it will help to make Korea AI less expansionist in the game, just like the real history. (Bottom picture is about the political and scholar factions ("Bungdang") in the Joseon dynasty. Which had the strong relation with literary purge events in the current game.) Also, theses modifications will help user to have more satisfying game plays (in our expectations).

If the EU4 developers or mod developers have the strong favors about the unique Korean characteristic, our community will be glad to share the data about it.


P.S) We started to gather community's opinion from the September 3rd (When the manchu DD was uploaded), and planned to post it on the forum before the September 10th's DD. However, there were some technical problems including translations, so we are a little bit late. Please consider that this post did not considered the contents in the September 10th's DD. Actually our community was shocked and satisfied about the developer's consideration in that DD.

P.S.S) Sorry for Re-upload the post again. There was technical problems...
 
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The biggest problem is that you can't model Korean factionalism that well in EU4. The new "estates" shown for 1.29 seem to be based on the Hungu (훈구파) and the Sarim (사림파). There doesn't seem to be any events that split the Sarim faction into the Seoin and the Dongin.
 
If they are going to give you a mission to develop your nation they should also give development cost in nation ideas. That would encourage playing tall as well though it is a very strong idea in my experience but I don't think it is that useful in world conquests though.(though I haven't done a world conquest yet. Haven't really tried except once when I conquered about 4/5 of the world. I have done money cap a number of times. I even put it on you tube but then I deleted my account for other reasons.)

I do hope they make korea or its national ideas stronger.
 
I think it would be better to give Kyeong-yeon as a government system of the Confucian nation than as a NI of Joseon. That's because it was also implemented in China.

I also agree to give Joseon the Artillery combat ability, but I don't think it needs to be NI. Ming had many more advanced gunpowder weapons than Joseon. Still, the only NI related to Ming's current gunpowder arsenal is Red Cannon. During the Imjin War, Joseon learned how to make various kinds of artillery pieces from Ming's support forces and later produced a large number of Chinese gunpowder, including the Frankish gun. Only 50 years later, Joseon lost the war against Qing to Red Cannon, and only after nearly 100 years later began producing Red Cannon. Of course, Joseon had many excellent weapons such as Daejanggunjeon and Bigyeok-jincheonloe as you mentioned. It is clear that Hwacha is also a great weapon, but Joseon did not deploy it in large quantities because it lacked gunpowder. I hope Paradox will give Joseon the Artillery combat ability as permanent Modifier.


Mountain fortress NI itself seems not bad, but this seems to overlap with Uibyeong. In addition, the problem of Mountain fortress, such as the Joseon-Qing war, had little means to respond if the invading troops ignored the fort and moved quickly. Of course, despite these shortcomings, there is no shortage as a characteristic of Korea as there are more than 1,000 sites for fortresses in Korea, including those of the ancient Three Kingdoms Period.


It sounds interesting to include ginseng trade as Korea's NI. Trade between Korea and Japan, however, was extremely limited, and even this became more limited after the Japanese riots before the Imjin War.(The trade volume with Japan has been limited to 20 ships a year since the 'Threaty of Giyu(기유약조己酉約條)' signed between Joseon and Japan after the Imjin War. The Japanese limit before the uprising was 50 ships.)

https://en.wikipedia.org/wiki/Tributary_system_of_China
Joseon's trade volume with China was just a tributary-trade of envoys, and trade in the Junggang(중강개시中江開市) since the Imjin War did not last long. Paradoxically, this small amount of trade and the high quality of Korean ginseng have greatly influenced Korea's ginseng industry to be known as the best medicine of its time. In the late 18th century, when Joseon succeeded in growing ginseng, and Qing reduced the number of tributary-trade, the amount of private trade increased more than the tributary-trade, resulting in more ginseng being exported to China.


Sam-sa would be better than Amhaeng-eosa. Amhaeng-eosa had a high failure rate, and its efficiency was greatly reduced because of its collusion with local officials in the latter part of the Joseon Dynasty.



1480%EB%85%84_%EC%9D%B4%EC%A0%84_%EC%9A%94%EB%8F%99%ED%8C%94%EC%B0%B8.JPG

https://cafeptthumb-phinf.pstatic.n...bL-kct8g.JPEG.hyukjunseo/1480년_이전_요동팔참.JPG?type=w740
(image link, Eight relay stations prior to the 1480s)

There are several problems with your proposal to prevent the expansion of Joseon. Not until the 1480s, let alone 1444 years, Ming did not rule all of Liaodong. In the year King Sejong became king, he sent troops to Yeon-san(연산連山) in Liaodong to capture SimOn. At this time, the land between Yeon-san in Liaodong from the Yalu River was not the land of either Ming or Joseon. The area was neutral and Ming's boundary was as far as Yeon-san.
Ming's troops stationed in Liaodong have declined significantly since 1449, down from an initial 150,000. As the Esen Taishi attack of 1449 was added as an event in this patch, I think change in Liaodong is also necessary. Due to serious security threats, Ming could have regressed in Liaodong for defensive advantages, as was the retreat at Hexi Corridor. In this case, Liaodong will either be given to Joseon with the title of King Simyang(심양왕瀋陽王), the title that the king of Goryeo had, or face serious attacks from Essen Taishi as a new independent country. Of course, if Liaodong is given to Joseon, it will have to participate in the war against Essen Taishi as an ally of Ming. - Well, Why must Jurchen be unified, expand and devour the whole of China? If it could be Jurchen, Esen Taishi, or Li Zicheng's Shun Dynasty, why not Joseon?
 
The biggest problem is that you can't model Korean factionalism that well in EU4. The new "estates" shown for 1.29 seem to be based on the Hungu and the Sarim There doesn't seem to be any events that split the Sarim faction into the Seoin and the Dongin.

I agree with idea. Actually, many "Bundang" related paper plans what I have seen are trying to using new government rather than estates. One of them uses competing system like the legalism mechanism in Islam. Then, if one side dominates and the certain period (New king's succession or events) comes, than dominated side's buffs and debuffs are accumulated and new competing two factions arise from the previously dominated side.

I think it would be better to give Kyeong-yeon as a government system of the Confucian nation than as a NI of Joseon. That's because it was also implemented in China.

I also agree to give Joseon the Artillery combat ability, but I don't think it needs to be NI. Ming had many more advanced gunpowder weapons than Joseon. Still, the only NI related to Ming's current gunpowder arsenal is Red Cannon. During the Imjin War, Joseon learned how to make various kinds of artillery pieces from Ming's support forces and later produced a large number of Chinese gunpowder, including the Frankish gun. Only 50 years later, Joseon lost the war against Qing to Red Cannon, and only after nearly 100 years later began producing Red Cannon. Of course, Joseon had many excellent weapons such as Daejanggunjeon and Bigyeok-jincheonloe as you mentioned. It is clear that Hwacha is also a great weapon, but Joseon did not deploy it in large quantities because it lacked gunpowder. I hope Paradox will give Joseon the Artillery combat ability as permanent Modifier.


Mountain fortress NI itself seems not bad, but this seems to overlap with Uibyeong. In addition, the problem of Mountain fortress, such as the Joseon-Qing war, had little means to respond if the invading troops ignored the fort and moved quickly. Of course, despite these shortcomings, there is no shortage as a characteristic of Korea as there are more than 1,000 sites for fortresses in Korea, including those of the ancient Three Kingdoms Period.


It sounds interesting to include ginseng trade as Korea's NI. Trade between Korea and Japan, however, was extremely limited, and even this became more limited after the Japanese riots before the Imjin War.(The trade volume with Japan has been limited to 20 ships a year since the 'Threaty of Giyu(기유약조己酉約條)' signed between Joseon and Japan after the Imjin War. The Japanese limit before the uprising was 50 ships.)

https://en.wikipedia.org/wiki/Tributary_system_of_China
Joseon's trade volume with China was just a tributary-trade of envoys, and trade in the Junggang since the Imjin War did not last long. Paradoxically, this small amount of trade and the high quality of Korean ginseng have greatly influenced Korea's ginseng industry to be known as the best medicine of its time. In the late 18th century, when Joseon succeeded in growing ginseng, and Qing reduced the number of tributary-trade, the amount of private trade increased more than the tributary-trade, resulting in more ginseng being exported to China.


Sam-sa would be better than Amhaeng-eosa. Amhaeng-eosa had a high failure rate, and its efficiency was greatly reduced because of its collusion with local officials in the latter part of the Joseon Dynasty.



1480%EB%85%84_%EC%9D%B4%EC%A0%84_%EC%9A%94%EB%8F%99%ED%8C%94%EC%B0%B8.JPG

https://cafeptthumb-phinf.pstatic.net/MjAxNzAxMjJfMjU2/MDAxNDg1MDkwOTk0MjAw.-Iyr86FZ2kTuEsc3BxiuDETcor07O6XbSIMzH_qQvJIg.9IhyUR30wnw0RdKmYIh55HvKtYoss6c3qFKebL-kct8g.JPEG.hyukjunseo/1480년_이전_요동팔참.JPG?type=w740
(image link, Eight relay stations prior to the 1480s)

There are several problems with your proposal to prevent the expansion of Joseon. Not until the 1480s, let alone 1444 years, Ming did not rule all of Liaodong. In the year King Sejong became king, he sent troops to Yeon-sanin Liaodong to capture SimOn. At this time, the land between Yeon-san in Liaodong from the Yalu River was not the land of either Ming or Joseon. The area was neutral and Ming's boundary was as far as Yeon-san.
Ming's troops stationed in Liaodong have declined significantly since 1449, down from an initial 150,000. As the Esen Taishi attack of 1449 was added as an event in this patch, I think change in Liaodong is also necessary. Due to serious security threats, Ming could have regressed in Liaodong for defensive advantages, as was the retreat at Hexi Corridor. In this case, Liaodong will either be given to Joseon with the title of King Simyang(심양왕瀋陽王), the title that the king of Goryeo had, or face serious attacks from Essen Taishi as a new independent country. Of course, if Liaodong is given to Joseon, it will have to participate in the war against Essen Taishi as an ally of Ming. - Well, Why must Jurchen be unified, expand and devour the whole of China? If it could be Jurchen, Esen Taishi, or Li Zicheng's Shun Dynasty, why not Joseon?


Thank you for long and thoughtful comment. Our team understood the paradox developer's NI design policy as the choosing a representative features, even if it has both the shortcomings and advantages. For example, "Spanish Inquistion" in castille just gives the missionary strength, although it reduces the flexibility in the society. For the mountain castles, Korea failed to stop the manchu with those castles. However, it is due to the manchu's wargoal, which was just capturing the capital. When the war requires to conquer the whole country (like the Imjin war after the run of Sejo), the mountain castles demand their enemy to spare more bloods. One of famous example is the Battle of Haengju. Since these mountain castles are one of representative Korean defense system, we suggested this as NI with defensiveness.

For the firepower, It is true that Korea was always had problem in their gunpowder sources. However, as you mentioned, early Korea developed impressive field firepower like Hwacha. Moreover, in the Imjin war, Korea used their firepower like "Bigeok-Jincholle" effectively against Japanese army. As a result, we thought that Korea deserves artillery combat power as NI. It is true that Ming used the more firepower, but it does not tell that Korea does not deserves firepower NIs.

And about your comments related to ginseng trade, I think it is also good and quite applicable to new event chains.

Finally with Lioadong, I think there should be an event that Ming makes Lioadong as march... It is my personal opinion.
 
Thank you for long and thoughtful comment. Our team understood the paradox developer's NI design policy as the choosing a representative features, even if it has both the shortcomings and advantages. For example, "Spanish Inquistion" in castille just gives the missionary strength, although it reduces the flexibility in the society. For the mountain castles, Korea failed to stop the manchu with those castles. However, it is due to the manchu's wargoal, which was just capturing the capital. When the war requires to conquer the whole country (like the Imjin war after the run of Sejo), the mountain castles demand their enemy to spare more bloods. One of famous example is the Battle of Haengju. Since these mountain castles are one of representative Korean defense system, we suggested this as NI with defensiveness.

For the firepower, It is true that Korea was always had problem in their gunpowder sources. However, as you mentioned, early Korea developed impressive field firepower like Hwacha. Moreover, in the Imjin war, Korea used their firepower like "Bigeok-Jincholle" effectively against Japanese army. As a result, we thought that Korea deserves artillery combat power as NI. It is true that Ming used the more firepower, but it does not tell that Korea does not deserves firepower NIs.

And about your comments related to ginseng trade, I think it is also good and quite applicable to new event chains.

Finally with Lioadong, I think there should be an event that Ming makes Lioadong as march... It is my personal opinion.

Yes, I think Mountain Fortress is not bad as a feature of Korea. In EU4, however, the fortress creates an area that cannot be bypassed. That is why I think it is different from the Mountain fortress of Joseon. Mountain fortresses and Hwacha are suitable for Joseon and deserve to represent Joseon. But I think these are more suitable for permanent modifiers than for NI. Mountain fortress is vague at what point to put in NI, and Hwacha's position already has Hunminjeongeum and Gyeonggukjeon. I don't think Hwacha is important enough to replace them. I am not saying that Mountain Fortress and Hwacha in Korea are not harmonious. This means they don't have the symbolism to replace Korea's NI.

The Ming Dynasty completed the Frontier Wall(遼東邊墻, It is not part of the Great Wall) of Liaodong only in 1546(嘉靖二十五年). This is in line with Ming's policy shift to a passive defense policy, and since then Ming has begun to lose control of Jurchen. The influence on Jurchen recovered slightly after Li Chengliang became the General of Liaodong, but completely disappeared with the emergence of Nurhachi. The Frontier wall was revamped when Altan Khan of Tatar attacked the fragile Liaodong. Ming's Liaodong military base was located in the western part of Liaohe(Guangning(廣寧, now Běiníng). This is one of the nine garrisons to prevent Mongol, a more serious threat than Jurchen or Joseon.
I don't know why Ming tried to keep Liaodong. Since Yongle Emperors handed over areas north of the Great Wall to the eastern Mongol tribes, Liaodong has become a useless waste of taxes and difficult to protect. Liaodong did not need Ming with its own production capacity alone, and only by combining with Shandong could it be maintained. Even though Liaodong was a useless area, Ming tried to maintain Liaodong for no reason but that Yongle Emperors moved the capital to Beijing. This was unnecessary for Ming, and stiffened not only Ming but all of East Asia.