Feel free to correct me cuz Im still a little confused on what the drama was really about.

The translation was so confusing but I think I got the jist of it. Min gun's older brother left home because he was gay (?) He was off sleeping with other guys for money and fell in love with the blondie's father who started abusing him and I'm guessing he was bringing up the fact that he was a guy a lot and minjoo felt insecure and ended up transitioning (?) but then the father still wasn't satisfied and kicked minjoo to the curb. Anyways, it all down spiraled into minjoo not wanting his little brother min gun to date his ex's son because he didn't want either of them to have anything to do with the family.