Moon Joon Woo (Kim Hyun Joong) who has the ability to stop time, meets Kim Sun Ah (Ahn Ji Hyun) who is unaffected by it. Due to his ability, he leads a lonely existence. He rents a basement apartment from Sun Ah who is struggling financially to pay her father's debt to keep the building. Joon Woo is surprised to find Sun Ah is able to freely move around and "live" even when he has stopped time. What will happen with another person in his separate life?