After unwittingly stealing money from a cartel, a cash-strapped professor finds the only way to save his broken family is by working as a drug courier.

Disguised under the shadows of a mask, a crew of desperados band together under the leadership of a criminal mastermind known only as “The Professor” to pull off the biggest heist Korea has ever seen.

A gutsy crew of Joseon pirates and bandits battle stormy waters, puzzling clues and militant rivals in search of royal gold lost at sea.