After being involved in a traumatic incident, 17-year-old Gong-ju is forced to change schools. Uncared for by her parents, her previous teacher arranges for her to hide away at his mother's place. It takes time for her past to catch up with her, but when it does the revelation is devastating.
| Actor | Role |
|---|---|
 Chun Woo-heeHan Gong-ju | Han Gong-ju |
 Jung In-sunEun-hee | Eun-hee |
 Kim So-youngHwa-ok | Hwa-ok |
 Lee Young-ranMs. Lee | Ms. Lee |
 Kwon Beom-taekChief of Police Substation | Chief of Police Substation |
 Jo Dae-heeLee Nan-do | Lee Nan-do |
 Kimchoi Yong-joonDong-yoon | Dong-yoon |
 Kim Hyun-joonMin-ho | Min-ho |
 Yoo Seung-mokHan Gong-ju's Father | Han Gong-ju's Father |
 Seong Yeo-jinHan Gong-ju's Mother | Han Gong-ju's Mother |
 Kim Jung-palOwner of Animal Hospital | Owner of Animal Hospital |
 Dong Hyun-baeSwimming Instructor | Swimming Instructor |
 Son Seul-giMin-seo | Min-seo |
 Lee Chung-heeChung-hee | Chung-hee |
 Min Kyung-jinVice Principal | Vice Principal |
 Kim Ji-sooMin-ho Group | Min-ho Group |
 Baek Ji-wonNurse | Nurse |
 Oh Hee-junMin-ho Group | Min-ho Group |
| YYim Dong-seokDong-yoon's Father | Dong-yoon's Father |