Ji-hyeon is enjoying her life after a female sex-change operation. One day a boy knocks on her door claiming that she is his father. Her attempts to act like an ordinary father conflicts with her life as a woman.

At the cusp of the founding of Joseon Dynasty, an envoy from China is delivering Emperor’s Ming’s Royal Seal. But nature in the form of a giant whale intervenes and swallows the royal seal. When a generous reward is offered to whomever can retrieve the royal seal from the belly of the whale, the race is on. A group of mountain bandits led by Jang Sa Jung and a group of pirates led by Yeo Wol go after the lost treasure, but who will get to to it first?