Sunwoo is not the type who likes to join his gang to do prank. But for some reason today he chose to join in because he was a bit bored. They were waiting in front of the canteen choosing their target. Then one of them started first to attack a female student. He started throwing eggs at her followed by the other members, including Sunwoo. But a second later Sunwoo realized that he had just made a mistake when he realized that their target was you, his sister.