Yesung was the playboy of SM high. But everything changed when he met Krystal, who is a playgirl secretly. They went out with each other for only 6 HOURS!. Krystal stole Yesung's heart in just seconds but Yesung didn't stole hers instead she used him to make the one she loves jealous. When Krystal told the truth about her plan, Yesung's heart broke into piec