Mujang is one of the characters of Shin Angyo Onshi and is a warrior who has dedicated his life to martial arts. He is an expert of hapki, and has taught many people how to use it effectively, including some members of the Hwalbindang. Why he has joined Aji Tae's side is unknown, but it assumed so he can find stronger opponents and hone his skills. Despite originally appearing to be a friend on Aji Tae, he now seems to be in conflict with him and his actions. He fights with Jung Son, claiming prior to the battle that it excited him for "the past's strongest to face today's strongest warrior". It is assumed he died in Aji Tae's explosion, which decimated most of the land and took with it many people. For a time, he acted as Sando's master, teaching her hapki.