Quick

A former motorcycle gang member, Ki-su, makes a living as a bike messenger. One day he witnesses a building blow up on the job. Never suspecting he could have anything to do with the bomb, he moves onto his next delivery?which is escorting a girl group singer, A-rom, an ex-girlfriend from his biker days. As she puts on a helmet, a timer mechanism is triggered and a countdown clock appears. Ki-su gets a call from a stranger telling him to make a series of deliveries within a fixed time limit. When Ki-su completes deliveries, each turns out to be a bomb.