I Wanted to Be a Passerby and Was Dragged into a Strange Revenge

My girlfriend and my engaged partner actually cheated on me! ? "I don't want to just break up, I want revenge!" Karl, who just wanted to be a passerby at school, faced a strange revenge drama because of his girlfriend cheating on him. What a strange development this is, the person who was cheated on was not me, besides! If you want revenge, can you stay away from me? It was obviously a secret revenge but it attracted a strange guy... Stay with the annoying guy and your revenge on the cheating partner begins.