Lee Kyoung-young

On the eve of the founding of the Joseon Dynasty, an unprecedented robbery shocks the nation-in-waiting: a whale has swallowed the Emperor's Royal Seal, and a bounty is placed on its retrieval. Now, every infamous gang of thieves, thugs, pirates, and government agents take to the seas, battling the elements, creatures of the deep, and each other to possess the mother of all rewards.  

After a fatal accident, Yu-gon, a former police inspector, is sentenced to hard time in a prison he once helped fill. Once inside, he discovers the guards no longer control the entire prison but a vicious crime syndicate that breaks out at night, using their prison sentences as the perfect alibi to commit intricate heists. Looking for revenge against the system that placed him inside, Yu-gon joins the syndicate... but with every man out for himself, how long can the perfect crime last?