Kang Baek Ho is attending the wedding of his best friend, who was also his elementary school classmate. Baek Ho realizes he has always been in love with her, but because of his ineptitude as a friend, he has never been able to reveal his true feelings. After the wedding, feeling lonely and depressed, he meets a strange man who will take him back in time to make amends for his mistakes and fulfill his dream: to marry Ham Yi Seul. Will Baek Ho be able to change the course of the past for a better future?