In the country of Daeho, Jang Uk (Lee Jae-Wook) comes from the noble Jang family. He holds an unpleasant secret about his birth, which people all around the country talk about. He is troublemaker. Jang Ukk happens to meet Mu-Deok (Jung So-Min). She is an elite warrior, but her soul is trapped in a physically weak body. She becomes Jang Wook’s servant, but she also secretly teaches him how to fight.
Seo Yul (Minhyun) comes from the noble Seo family. He seems perfect with good appearance, intelligence, and strong martial arts skills. Go Won (Shin Seung-Ho) is the crown prince of Daeho. He hopes to become a generous king.