To-il tutors high school student Ho-hoon, but she soon falls in love with him and gets pregnant. The film unfolds a series of playful happenings when To-il embarks on a journey to find her birth father for the wedding, though she is living with her step-father.
| Actor | Role |
|---|---|
 Krystal JungTo-il | To-il |
 Jang Hye-jinSeon-myeong | Seon-myeong |
 Choi Deok-moonTae-hyo | Tae-hyo |
 Shin Jae-whiHo-hoon | Ho-hoon |
 Lee Hae-youngHwan-gyu | Hwan-gyu |
 Kang Mal-geumHo-hoon's Mother | Ho-hoon's Mother |
 Nam Moon-chulHo-hoon's Father | Ho-hoon's Father |
| JJang Hat-salBok-nam | Bok-nam |
 Kim Joon-bumTeacher Choi | Teacher Choi |
 Kim Mi-hyangMaterial Grandmother | Material Grandmother |
 Lee Ju-wonTeacher Choi | Teacher Choi |
 Shin Mi-yeongFried Food Customer | Fried Food Customer |
 Lee Seung-chulBadminton Club Member | Badminton Club Member |
 Ahn Jae-minHo-hoon's Friend | Ho-hoon's Friend |
 Park So-eunWedding Guest | Wedding Guest |
 Kim Neul-meBadminton Club Member | Badminton Club Member |
| LLee Jin-juIl-wol | Il-wol |