Both

Taejoon and JoYoon are both suffering in pain. Taejoon suffering in the fact that he still loves JoYoon but choose to give up on Joyoon for his current BF because he doesn't want to hurt him (but that's kinda absurd) while Joyoon suffering because of taejoon. Throughout his life, taejoon was the only guy he loved. He's been living his life spending his time and feelings with taejoon. But becuase of the accident happened to joyoon, their longtime relationship broken part. I'm really expecting that taejoon will chase joyoon after and will break up with that bitch!!!