Responses
Maybe the creep that Jiwon punched out & got in trouble? Though that doesn't seem likely. Like you say, someone from his past -- maybe with malice against MD as well?
Yep I don't think that bully comesback, didn't like the character. Could also be an abusive ex. Chanwoo mentioned to MD in the middle of their plays :/ that he did smthg similar with another person but he got hurt, means that his ex didn't care about his feelings :''/
Chanwoo has sucha a bright personality, he hides smthg, maybe some homophobic bully from the past? I remember chanwoo telling something about his past to Dg. He used to defend himself, seems like he deals with his problems alone now he has people who care about him :')