After Kai's GF broke up with him to pursue her dream to become a star. Kai find himself accidentally send to the future. In the future he's determent to search for his lost love, only to find himself falling in love again with someone else. A boy name Taemin, a famous celebrity from this time. Kai not only struggle with the thought of been in love with another boy, but also with the posibility that this boy could be his son.