Let's just say, they're all at fault. They're all broken tbh. Yoon just woke up from 5 years coma then found out his lover is dating somebody else already, Taejoo whose in pain for 5 years, assuming his lover died then finding out his alive after all those times, Youngwoon whose just in love, Kwon whose bestfriend died. They just need time and more communications.
He's like a teenage boy that is experiencing having a crush for the first time