In the late Goryeo Dynasty, the loyal official Yu Man-su attempts to offer the gold-laden Bojang Island to the nation, but loses the island due to Lee Ja-ryong's scheme and is imprisoned. Yu Man-su's son, Yeong-pung, on his way to find Lee Ja-ryong, gets acquainted with a courtesan named Ok-mae. Upon arriving at Daehaengsan and finding Lee Ja-ryong, Yeong-pung sees Ok-mae tied to a pillar and rescues her. However, he faces a deadly crisis due to Ok-mae, who was in league with Lee Ja-ryong. Afterward, Yeong-pung, realizing everything, punishes Ok-mae and captures Lee Ja-ryong, then heads towards Goryeo with him.