Shin Woosung is 19 years old, he used to be Hangil's childhood friend and lived with Hangil along with an old man named Taebom and also Taebom's children, but after some time after that Woosung learned about martial arts and he became arrogant and evil, he burned Taebom's house and that caused Taebom and his children to die, Hangil was very upset and hated Woosung and they started to act like they didn't know each other but their hatred was still there he really wanted to kill hangil's friends