i actually understand yoonseul. it's not easy to come to terms with your feelings specially if it's your first time liking someone of the same sex. what he did wasn't right tho, he approached kangjoon not because he felt bad about what he did before, but because he wants to clean his conscience. not to mention that he lead kangjoon on. so idk, i like yoonseul but i still have mixed feelings about him.
idk how to explain this well but -ah and -yah at the end of the names are actually a suffix to address people of the same rank, it's mostly just done between close friends or someone younger. and for the jeong-han and jung-han, it's actually the same thing, korean names/words with "eo" can also be spelled with "u". but anyway, you did a really great job. thanks for translating :)
this is the first time i'm saying this about a character that is an asshole but i think jeonghan is a really well-written character. i still don't like him but i think the author did good with the way he is portrayed.