At the end of the Yuan Dynasty, when Mongolia was ruling all of the Chinese continent, the Mongolians, the Hans, and the Koryo (ancient Korean) migrants were going through racial conflicts while experiencing the strife of local baron's rivalry. Jinha, son of a Koryo migrants, falls for Sullie, illegitimate daughter of a Mongolian commander. After some time, Jinha knows the secret of his parent's death. Sullie's father, Taruga wants to kill Jinha for his Bichun Secret Arts, the strongest martial secret. Nevertheless it can't stop them from heading for a hiding place to love each other. Caught by Taruga, Jinha is shot by arrows and falls from a cliff. Miraculously brought back to life, Jinha is reborn as Jahalang, a hired assassin, and is back for revenge....