Well after reading raw on chapter 1
All of them turned into adults, i think they was around thirties, the bullied kid grown up into handsome man.
the main bully seems have good life , in reunion party, he was making party speech and say toast and cheers, but then mc come, everyone realized he was the bullied kid, all people who have bullied mc seems kinda regret and feels guilty, many of them try to have chat with mc and some even say sorry for bullying you.
The main bully seems unhappy seeing mc, he talk shit to mc, and mc just smile on him, he say i miss bullying you, you are still loser no matter what compared to me
The bully have daughter, high school girl, she was bullied, mc tell her is she get bullied ? because he also get bullied in the past and show his arm, full of cigaratess fire scars, he smile saying he will help her but actually he have a revenge plan on the main bully by using his daughter.