On the eve of the founding of the Joseon Dynasty, a whale swallows the Royal seal of Emperor Ming, the seal was brought by a group of China. Emperor Ming offers a huge reward to the one who manages to bring back the Royal seal. A group of bandits in the heart of the mountain led by Jang jung-To-decide to venture by sea to hunt whale. However, shortly after, they will be forced to face his Yeo-wol, a female pirate captain and a large number of adventures. Yeo-Wol has just 10 days to hunt seal and whale to find otherwise you will be forced to endure a series of disastrous consequences.