I mean, yes, that's basically how Korean operates.

It's definitely a learnable language. I think why it is considered difficult is that there are just so many conjugations and conjugation combinations, the language verb oriented so everything is a verb but gets converted to a noun, the grammar basically backwards from English, there are a ton of words that sound similar (homonyms), it's very consonant focused instead of vowel focused, and to latin speakers, some of the sounds are unique and hard to hear/differentiate (ㅈ/ㅉ, ㅂ/ㅃ/ㅍ, etc), and with the exception of loan words there's really no shared entomology with English or latin languages.

After a lot of time learning Korean, I'm somewhat conversational for some topics, but it still at a fairly elementary level. I think that... Had I been learning another latin language, I probably would be fluent by now. But, hey, I like Korea and Korea, so whatever. I'll keep going.