Not that I agree but I think the OP was making that statement within the context of the story not IRL. Their opinion seems valid within that context since the story sets it up as if its possible to overcome it. I personally don't know enough about the disorder to make statements about it outside of what the story explained/set up.
damn a lot downvoted but I agree with you. Dongjae is just too much, falls inlove way too easily, and a selfish human being. The fact that he said that he likes Tae Jun just because, when he fell in love with the face of Tae Oh right from the start. And if I remember it correctly, he did say he is sucker for handsome faces. So... confessing your love when you fucking just met him twice says a lot about Dong Jae's personality.
The ml choosing to not overcome a serious mental disorder for Dongjae’s benefit is actually so messed up. And him asking the no to do that for his own benefit is so selfish. This story had potential but Ma Dongjae was immature and selfish throughout and that ending is just messed up.