King Game 

Chomin has been violently bullied since middle school, but when his estranged brother suddenly dies in a motorcycle accident, Chomin finds out he was the leader of Imperial Gang, a huge gang. Now in possession of his brother's phone, Chomin seizes this chance to get revenge on his high school bullies by ordering his brother's underlings to beat them up. But the King Game begins when his brother's girlfriend shows up and threatens to expose him unless he cooperates in taking down a rival gang. With his life now on the line, can Chomin manage to continue this farce? (Source: WEBTOON)