transfer student is an assassin

transfer student is an assassin, kim sung the well trained assassin lost his childhood memories, he remember some of them while he was on a mission. At the same time he was assigned to the mission to eliminate the traitors with in the Korean branch of blue dragon group he was infiltrated with. with in the gained memories of kim sung, he discovered that his real parents are from Korea. kim sung decided to work in shadow by staying with his real parents. will he be able to complete his mission or will he change his mind and stay with his real parents forever and what are the threats are kim sung his real family are going to face if he quit being a assassin.