When her son gets critically injured in a car accident, a mother discovers that there's more to his relationship with his friend than she had thought.
| Actor | Role |
|---|---|
 Bae Jong-okMee-kyung | Mee-kyung |
 Lee Won-keunYong-jun | Yong-jun |
 Ji Yun-hoSoo-hyun | Soo-hyun |
 Seo Jeong-yeonHee-young | Hee-young |
 Park Won-sangJin-kyu | Jin-kyu |
 Park Hye-jinMs. Park | Ms. Park |
 Kim Ja-youngGeum-sun | Geum-sun |
 Baek Ji-wonSook-jung | Sook-jung |
 Kim Yae-eunJi-yeon | Ji-yeon |
 Woo Ji-hyunHan-sung | Han-sung |
 Kwon Dong-hoKyung-jun | Kyung-jun |
 Kim Soo-bokMr. Kim | Mr. Kim |
 Bae Yong-geunHomeroom Teacher | Homeroom Teacher |
 Kim In-gwonAssistant Manager Lee | Assistant Manager Lee |
 Ji Sung-eunDoctor | Doctor |