Yeon Sieun is a new student at Eunjang All Boys High School. Eunjang is a very dangerous school that takes in rough and delinquent boys and students who struggled to get into other institutions. But Yeon Sieun is the opposite of a student that struggles. He had top grades in his old school back in Busan. Sieun was actually born in Seoul, but his family decided to move when he was only 5 years old.