Sure, I agree but disagree, sure Seungeon helps Jiwook sometimes but that's all.
It doesn't change the fact that he overstepped Jiwooks boundaries by kissing him, him slapping Seungeon was nothing but self-defense. Seungeon needs to know that no is no and that he should just give up, or he could just agree to be just friends and get closer and Jiwook could fall in love with him or something like that but no, he decides that it's "not enough" for him.
Have a nice day :)