Yeolliji

A world is governed by groups known as the descendants of god, possessing unique abilities, including the Heuk and Sahwa clans. The Heuk clan is destroyed by the Parang clan, a group of ordinary humans. To show submission, the Sahwa clan sends their heir, Ga-Yeon, to marry the Parang heir. Instead, Ga-Yeon's twin brother, Ja-Yeon, is sent in his place. He now resides among the Parang clan.