A likeable, married high school teacher spirals out of control when a student in his class begins unintentionally reminding him of his doomed first love, which ended 17 years earlier.
Seo In-woo
In Tae-hee
Im Hyun-bin
Yeo Hye-joo
Kim Chul-sung
Kwak Yoon-jung
Kim Jin-tae
Lee Dae-geun
Kim Min-jae
Cho Jae-Il
In-woo's Wife
Director of Student Affairs
P.E. Teacher
Professor of Sculpture
Substitute Teacher of Korean
Courier
Supermarket Owner
English Teacher
Sculpture Schoolgirl
2-5 Class President
