Yeonwoo falls in love with Dal after seeing him in his mother's graduation album. He dreams of Dal frequently after that, and and decides to confess to Dal in his dreams. But Yeonwoo's confession causes him to travel to the past, where he meets a living and breathing Dal, who offers him a home and job. How will Yeonwoo and Dal's relationship develop, and how will Yeonwoo ever return to the future? Or does he even want to?