Gi-soo, Myeong-sik and Ah-rom all used to be part of the same notorious motor cycle gang. Now Gi -soo works as a motorcycle delivery man. One day the delivery package suddenly explodes and Gi-soo gets a call telling him that their is another bomb planted in his helmet which Ah-rom, who rode in the back, is wearing. Gi-soo is ordered to take another delivery. If the delivery is late or he attempts to run away the helmet will explode.
