Responses

He did mention that he was in construction. MC knows that gangster types are in the business frequently and he has tats which in Asian culture is still something that is associated with 'bad' people. So he 'knows' but since ML is so kind to him he just pushed that out of his mind. I like the ML is actually morally gray, he's so good to MC but is still ordering murders without any qualms. He says he a sadist but it's been shown that he doesn't enjoy beating people for work, he only likes it in a play setting when the other person likes it too.
Wait I don't remember earlier chapters did it never come up that he's a gangster??? What did he think of ahjussi if he's only now getting surprised from blood bro