Yifan graduated the youngest in S.O.S history. He's completed several difficult missions on his own, and managed to take care of five other members. Which after getting to know them, is a lot more impressive than it sounds. So when the Headmaster surprisingly arrived at Yifan's office door to say encouraging words about the latest change. He felt confident. But now he's not so sure. Is it too late to quit? (Not that he's has a choice.)