Kang Baek-ho and Ham Yi-seul have been best friends since elementary school. Baek-ho has never acknowledged his attraction to her, unaware that Yi-seul has been in love with him for more than 20 years. Finally, at the wedding ceremony where Yi-seul is about to marry another man, Baek-ho regrets that he never confessed his love for the bride. A mysterious conductor suddenly appears and offers him a second chance to win Yi-seul's heart. Baek-ho travels back in time to various events of their lives hoping to change the outcome of their relationship. But changing the future is not as easy as it seems.

Yoo Seung-ho
Kang Baek-ho

Park Eun-bin
Ham Yi-seul

Go Kyung-pyo
Song Chan-wook

Kim Ye-won
Yoo Chae-ri

Lee Eung-kyung
Oh Jung-rim

Ju Jin-mo
Ham Sung-hoon

Kim Tae-hun
Kang Jin-woo

Park Jin-joo
Jo Jin-joo

Lee Hyun-jin
Kwon Jin-won
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