Ian wakes up in the middle of a car crash finding himself in the body of man he has never seen before. He doesn’t remember his own name nor where he lives. What he only knows is that his spirit is suddenly brought to someone else’s body, somewhere else, every twelve hours. Searching for clues and answers, he finally meets the mysterious woman, Jin-ah, who claims to recognise him. After revealing his identity, he’s determined to find a way back to his own body before a secretive organisation gets their hands on him.