Seoan already said he's controling and has a tendency not to trust others, and that's before his mental health issues. It's a flaw of his and ofc it's gonna show up in his current relationship so that he can start adressing it. Same thing with Woowon's inferiority complex, that's gonna start causing them issues so they can solve them and become a more secure couple. This story has been realistic since chapter one why are you freaking out coz characters have real flaws