[2][3] Choi Ik-ho (Lee Jung-jae), is a former footballer and UFC mixed martial arts star nicknamed "Zombie."

Then Ik-ho receives a phone call from Ace (Shin Ha-kyun), a genius mastermind who designs elaborate games for Korea's wealthiest citizens to bet astronomical sums of money on, conducted with real people in real-time using high-tech gadgets and CCTV cameras.

To save his brother's life and his own, Ik-ho is forced to join Ace's game and follow instructions from a mysterious woman named Soo-kyung (BoA).

Using his wits and skills against multiple adversaries, including cops and low-rent gangsters, Ik-ho completes seemingly impossible missions.

Then he reaches the final round, during which he must find his brother in a huge soccer stadium, with a bomb strapped to his ankle and time ticking.