讲述朝鲜时代义禁府最下层的下级管理人员每当夜晚便化身刺客铲除乱党的故事Kang Chil Woo was a lowly police officer during the Joseon era. His parents were killed in a raid and his main goal was to stay below the radar to survive. However when his sister was killed, his outlook on life was forever changed and in seeking revenge, he turned into an assassin and began to mete out justice to criminals.