A dangerous romance between the Joseon version of a widow hero with a mask and an uptight officer begins.

Trapped in the deadly cursed “Mafia Game,” the students of Yoo-il High must play the game to survive, while unraveling the mysteries behind the curse.

A man wakes up missing his memories. Directed by a mysterious voice from a device in his ear, he sets off on a hostage rescue mission rife with danger.