A contract killing organization is managed like a normal company. Hyung-do who regards killing as nothing more than repetitious routine is working for this company. A man loyal to his company and accepted as the firm’s best killer, Hyung-do one day starts feeling doubts about his job and decides to quit his job for a woman he is in love with. Instantly, he is under the threat of being hunted down by his former colleagues.

A man is on his way home when the poorly constructed tunnel he is driving through collapses, leaving him trapped.