A high school girl wakes up each day with no memory of yesterday. When she agrees to date a shy classmate, can their love grow with every new beginning?
| Actor | Role |
|---|---|
 Choo Young-wooKim Jae-won | Kim Jae-won |
 Shin SiaHan Seo-yoon | Han Seo-yoon |
 Cho Yu-jungChoi Ji-min | Choi Ji-min |
 Jin Ho-eunJeong Tae-hoon | Jeong Tae-hoon |
 Cho Han-chulKim Seong-hyeon | Kim Seong-hyeon |
 Lee Chae-kyungDoctor | Doctor |
 Jang Yoo-sangKorean Teacher | Korean Teacher |
 Yun Ki-changMath Teacher | Math Teacher |
 Yoo Ah-reumJae-won's Mother | Jae-won's Mother |
| LLee Gyeong-hwaSeo-yoon's Mother | Seo-yoon's Mother |
 Ryu Sun-gyuSeo-yoon's Father | Seo-yoon's Father |
| MMoon Jeong-hyeonKoo Dong-sik | Koo Dong-sik |
 Park Jae-hyeonTroubled Student 1 | Troubled Student 1 |
 Moon Si-hwanTroubled Student 2 | Troubled Student 2 |
| LLee Heon-jinTroubled Student 3 | Troubled Student 3 |
 Lee Seok-binTroubled Student 4 | Troubled Student 4 |
 Kim Ha-rangYouth Basketball Team Student 7 | Youth Basketball Team Student 7 |
 Lee Kyung-chaeStudent | Student |