I didn't really see it that way personally, it was kinda like their usual banter? So what Dojoon likes about Jaewon is that he's this loud and brash "parrot", he rebels and, well, you know the guy lol. But what Dojoon likes most is when Jaewon gives in and goes more quiet and just let's Dowoon have his way. I guess he likes he's this way only for him. So in chap 55 when Jaewon came up and was like "hey I won't fall for you" his whole demeanor basically said he'd already fallen for Dojoon, because if he really didn't want to fall for him, he'd do his shout, insult and run away routine lol. So that's why Dojoon was so pleased. And he was kinda teasing like "oh sure don't fall for me if you can" because he knew that Jaewon basically already fallen and he (Dojoon) is not giving up anyway. So yea that's what my take is, I guess we'll see in the next chapters of I'm right lol

Iam confused. Like are they ml n mc not on talking terms ? Did the ml Ditch him ? Why he so sad all of a sudden. He is just a lookalike to someone from the ml past and ? I am not getting the story . What happen after the hospitalization? Why is mc sad about the the ml ?