
I think cha yoon gon was probably sexually assaulted as a kid by one of his teachers and that’s why he started sleeping around ( hyper sexual) and why the sister and his father “put up with his behavior”. Probably ended up running away and found the strip club when he didn’t have any money or a home and that’s why he has a debt to them. I could be wrong tho but that’s what all the context clues is pointing to, to me.
I’m going to let this marinate, one chapter a week is not enough