Following the glorious all-girls high school days, a reunion is held at the cafe of the class president Yeon-mi, facing the secrets that they have hidden for 20 years and growing up understanding each other.
| Actor | Role |
|---|---|
 Lee So-yeonPark Yeon-mi | Park Yeon-mi |
 Jeon Hye-binJeong Ju-ri | Jeong Ju-ri |
 Son Yeo-eunKim Su-jin | Kim Su-jin |
 Jeong Soo-youngNam Hee-nam | Nam Hee-nam |
 Oh Seung-eunYoo Jin-hee | Yoo Jin-hee |
 Lee Yu-miSin Hyeon-soo | Sin Hyeon-soo |
 Choe Hye-jinPark Yeon-mi (young) | Park Yeon-mi (young) |
 Choi Da-eumJeong Ju-ri (young) | Jeong Ju-ri (young) |
 Ko Joo-heeYoo Jin-hee (young) | Yoo Jin-hee (young) |
 Jeong Ye-inSin Hyeon-soo (young) | Sin Hyeon-soo (young) |