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.

The story of a man named Yook Dong-sik who coincidentally witnesses a murder and picks up the killer's diary. While fleeing the scene, he gets into a car accident causes him to lose his memory. Due to the diary in his possession, he mistakenly believes that he is a psychopathic serial killer.

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.

The story of a man named Yook Dong-sik who coincidentally witnesses a murder and picks up the killer's diary. While fleeing the scene, he gets into a car accident causes him to lose his memory. Due to the diary in his possession, he mistakenly believes that he is a psychopathic serial killer.