All relationships have issues, but Woo-jin's identity crisis is new - in fact, it's new every day. Every morning, Woo-jin wakes up in a different body. His age, gender, and nationality may change, but the one constant in his life is Yi-soo - the woman he loves. She knows his secret and loves him anyway. With every transformation, Woo-jin has to figure out how to return to his body and reunite with Yi-soo.