Woo-jin wakes up in a different body everyday, regardless of age, gender and nationality. Sometimes he's a man, a woman, old, young, or even a foreigner. He's the same person on the inside, but on the outside he's always someone new. Looking at a different face in the mirror every morning is hard for him to get used to. The only constant in his life is the girl he loves, Yi-soo, who knows his secret and loves him anyway. Each time he transforms, Woo-jin must figure out how to reunite with Yi-soo.