Responses

Ehh thats more like just being a being an idol and possibly ostracized amongst his peers. It was shown beforehand that theyre all jealous of Yohan's fame. There was no flashback relating to this or anything. His attitude could be from a difficult parents or home life. Nothing mentioned anything about some sort of organ trafficking orphanage. Also excuse me i forgot to write that part in my comment.
Aughhhhh wtf man. WHERE DID THIS EVEN COME FROM??? I HONESTLY WOULDVE FORGIVEN THE SUDDEN BACKSTORY IF IT WAS VERY EARLY IN THE SERIES. Buttt nooooooo just casually drop a horrifying backstory and just expect us to be okay with it. There were no hints or signs of go yohan displaying signs or mannerisms of an abused child