A single mother and her daughter are forced to stop by a black car on the way home. When they regain consciousness, they are in a Karst cave with seven strangers. The game is to find out a killer among the nine.
| Actor | Role |
|---|---|
 Anita Yuen Wing-YeeHelen Xin / Xin Hailun | Helen Xin / Xin Hailun |
| XXiong NaijinZhen Ni / Jenny | Zhen Ni / Jenny |
 Archie KaoDanny Wong | Danny Wong |
 Zhang ZimuWang Sisi | Wang Sisi |
 Wu ChaoXu Chen | Xu Chen |
 Wu ZhensuSteven | Steven |