Probably because he was jealous that someone who never trained to be an idol could do what he always aspire and wanted to do... ( T﹏T ) Imagine working so hard to be good for a long time and then have a car crash and get told you can't do your dancing moves for a long while to heal, I'd probably be the same as him
The last time he was oj earth alive he tried to commit suicide, then he got to see someone else take ownership of his body, improve his life, and form bonds with his teammates, something he couldn't do himself, but who knows to what extent he was aware of what's happening. Then he finally takes over his body and gets thrown in a new environment, and different relationship dynamics with his members, and even huger responsibility, keeping up with the expectations the members and everyone expect of him now (the standard heyonsong sent) he's already mentally distressed and depressed, and it's all overwhelming, just because he died and finally got his body back doesn't mean he can suddenly do things he couldn't do before. And maybe the forceful reclaim of his body is taking a physical toll on him? He's annoying but I sort of get where he's coming from.

I don't really get it with og cheon yise. Someone amuse me pls. What's his deal? He's struggling mentally ik but why did he ruined everything? He got his body back. #-.-) no hate to him, i just want to know better