A legend tells of the Kingdom of Nangnang’s mystical Ja Myung Drum, which sounded when enemies approached. In truth, the drum is Princess Ja Myung.
Born at the same time to different mothers, Princess Ja Myung and Princess Nak Rang face a prophecy: one will save the nation, the other will doom it. With her mother’s influence, Nak Rang is named the savior, while Ja Myung, branded as the nation's ruin, escapes
