
Taejoo also devastated when Yoon was gone. He searched him for 5 years even though there was no sign of Yoon. He expected and accepted that Yoon was dead but that's all he knows even the family thought that Yoon was dead and felt happy when Taejoo find a love after he suffered Yoon's disappearance. But suddenly Yoon came back after those looooong years. And Taejoos thought that he was moved on but no, he's not. It's not easy to let go someone that you loved so much that's why I understand Taejoo's feeling right now

He can't go back to Yoon because of his new bf. We know that his bf has a psychological issue. We see that Taejoo finds it difficult to show that he has a new relationship. And we know they loved each other first so I understand Taejoo’s concern for him. But you're right. It's too late for him to go back to Yoon again.
this asshole. I feel like the author is trying to set us up to feel bad for him but my pity is honestly nonexistent. he was so cruel to yoon and didn’t give a shit about his feelings, but now he’s all sad and whiny because yoon moved on instead of suffering from wanting love from this asshole that was never going to give him any??