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.

Hundreds of cash-strapped players accept a strange invitation to compete in children’s games. Inside, a tempting prize awaits — with deadly high stakes.

Nicknamed after a human-devouring spirit, the ruthless leader of an overseas black ops team takes up a dangerous mission in a city riddled with spies.