Dokkaebi (Gong Yoo) needs a human bride to end his immortal life. Meanwhile, the Angel of Death has amnesia. Somehow these two meet and live together. They see off those who have passed away and are now leaving this world.
This drama is about a romance story between a time traveler and his wife. Yoo So Joon (Lee Je Hoon) is a CEO of a real estate company, who has the ability to travel through time via a subway. Song Ma Rin (Shin Min Ah) is her wife and works as a photographer. So Joon foresees his future-self living miserably so he decides to marry Ma Rin in order to avoid that fate. As time passes, he learns to love her selflessly.