Hey I'm glad you personally don't find Korean difficult, but by the measures used by people who teach and learn languages professionally, Korean is considered to be in the top tier of difficulty for native English speakers alongside languages like Chinese, Japanese and Arabic. You don't trust government ILR proficiency measures but you link to "onehallyu.com?"Compared to Chinese?Context is key here buddy.
Chinese is so much harder. Over 3000 Characters. Compared to the Korean alphabet which can be learned very, very quickly due to it's logical construction. Chinese is tonal meaning the same word can have different meanings depending on the inflection on each syllable. Korean is not. To say that Korean is as hard as Chinese or Japanese or Thai or any east Asian language I've encountered is ridiculous.
https://onehallyu.com/topic/318801-hardest-language-to-learn-korean-vs-chinese-vs-japanese/
I read and speak Chinese and I've studied Korean (and Spanish, and others) in the past. Chinese characters and tones take a serious initial time investment but Chinese grammar is more similar to English than Korean grammar. Simple orthography makes for a smoother learning curve very early on but makes no real difference at higher levels of competency.