On an ominous night with a stormy storm, single mother Xin Hailun (Yuan Yongyi), a yoga instructor, and her daughter Sisi (Zhang Zimu) were driving home when they were suddenly stopped by a black car. When the mother and daughter regained consciousness, they found that someone had changed them into red clothes and were in a cold cave. Helen then met seven other men and women she had never met. These people had different professions and did not seem to know each other. Then a mysterious voice came, announcing that they would have a death party next. Among the nine, there was a killer who would kill these people every time the hypnotic gas hit. They must find every means to find the real murderer and get out of the cave of death alive. After a series of suspicions and accusations, they killed each other, and blood splattered everywhere. After experiencing all this, Xin Hailun seems to have to face the most secret side of her heart in front of the cold female detective Jenny (Xiong Naijin)...
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