Obviously he’s not in the right mind, he’s been pining for her for a decade? He’s been insecure since he liked her in highschool and was a third-wheel but was overlooked by taemin.
It’s explained that he did it cause he didn’t feel like she was genuine about her love for him. He felt like she was just settling for him. And lowkey i get it, he’s been pining for her for years, she stayed even after she found out about him cheating because she wanted the gallery, being a gold digger, but he does love her and would choose her over that other girl if he’d just known she did love him.

I really do wish it’s not like those weak ass predictable stories where the ML is the brother, which is most likely but I’m hoping the ML is the cheating husband. Lol, i’m just bored of the same story lines and I like him better, he’s cute and fucking pathetic and weird and off-putting i like that.