Part time taxi driver and full time bum Ki-hoon lives one day at a time. His only wish is to live happily ever after with Hyun-hee. One day, Ki-hoon runs over a man while driving at dawn and it is only the beginning of his troubles. That same day, before the car accident, a corrupt businessman's mistress and her lover are hiding in a hotel room after having taken off with the man's dirty funds. But their happiness is short lived when things go haywire due to the man's cronies, cops and mistaken identities. As hitmen, cops, and the two lovers get entangled, one of them runs out with the money. But soon he runs into Ki-hoon's taxi and the man is killed on the spot. Ki-hoon thinks his luck has changed for the best when discovers the cash and leaves it in the care of Hyun-hee as she works her shift in a convenience store. Now the hitmen and the cops are hot on the trail of Ki-hoon. The paths of these unfortunate individuals come to a head at the convenience store.

In 1990, number of children suddenly disappear. Meanwhile, the Ministry of Defense selects an elite group of scientists for a top-secret mission. Then, 30 years later ... The year is 2020 on a reunified Korean Peninsula. A string of murders is committed against retired scientists. The Special Investigations (SI) unit staffed by a crack team from the former North and South Koreas and outfitted with the latest technology is brought in to investigate. The killer, however, far from being deterred, taunts them with a signature pendant at every murder scene. In an act of devilish boldness he even kidnaps the son of the investigation team's leader, Seok