honestly at this point, I don’t think he can change. i mean obviously he turned out like this due to his environment but the actions that he decided to do right now is what HE (no one else) decided to do. it’s a pity because if he collaborated with jihyun, they could’ve become a great duo that maybe would even be known worldwide but because of his inferiority complex, he decided to do these disgusting tthings instead. he deserves to be in jail.
Adding that he's potentially shizophrenic, I doubt he can be all good and friendly (well hopefully, he gets help with his illness).
I hope sangmin change soon and become a better person, he’s been harassed by his father for so long its so sad