Kwon Jiyong and Choi Seunghyun were close friends, working together as secret agents in Seoul. During a mission, Jiyong was heavily wounded. With his last breath, Jiyong made Seunghyun promise to take care of his younger sister since the mobster who shot Jiyong targeted his sister. From there, follows a journey filled with action, suspense and romance.   Characters: Kwon ___