Choi Jae-

Lee Sang-jun (played by Lee Jeong-jae) lost part of his memory due to a car accident. When he looks at a photo with excessive exposure, it touches the deepest part of his memory. It was a girl's face. His subconscious told him that there would be a very important memory related to this girl, so he asked his old classmate, Jiang Yongyi

It tells a story of a man who, by chance, shares the feelings of a woman one day, fully experiences the joys and sorrows of that woman and the emotions that develop. It is a fantastical love story about human nature and reasoning.