On a television show billed as “the greatest fight show on Earth,” eager amateurs with lots to prove boldly step into the ring and expect to leave bloody but victorious. The ratings hungry producers seek out “legendary” but largely forgotten streetfighters and mine their desperation for recaptured glory and redemption into ratings gold.

Nam-bok, a middle-aged South Korean farmer is conscripted and assigned a mission to deliver a classified military document that may decide the fate of the war. After losing it while under attack from the enemy, he then faces a teenage North Korean soldier named Yeong-gwang who happens to acquire the secret document on his way to the North.

After an extremely close national assembly race, Jong-chan wins the nomination of his party. He and his wife Yeon-hong are fully committed to the campaign and when their teenager daughter Min-jin goes missing, Jong-chan convinces Yeon-hong not to notify the authorities fearing negative publicity. With the election imminent, Yeon-hong decides to look for her daughter, but instead uncovers a twisted series of conspiracy, secrets, and lies surrounding Min-jin’s disappearance.

By chance, a man and a woman meet on the KTX train and spend 24 hours in the unfamiliar city of Busan, South Korea.