I think Joowon is a kid and is behaving just like a kid who is threatened m by his toy being taken away. His feelings and behaviors are not love I think but just jealousy and possessiveness :/
Yeah since both have been fooling around for the past years that none of them ever communicated how their relationship should progress. Everything started in a shitty, rocky way but they can choose to end it mutually and peacefully or start over again.
Sure, Haesoo's way of confirming Joowon's feelings for him is so like him but man all of this could've been avoided if they were open AND honest with each other.
Maybe they just do not Know what the heck they want :/
I might be wrong but it looks like Haesoo never thought Joowon could feel what he has always been feeling. And it looks like seeing his reaction, he just realised that their feelings were mutual. And I don’t know, he looked kinda happy? With all the blushing faces smh. Anyway I still have no clue about how this will end.