Chen Qiuye, an ordinary supermarket employee, lives an unremarkable life until one day, the intervention of Li Yanliang, a high school classmate he has not seen in years, sends his life spiraling downhill. Because of Li Yanliang's many strange actions, police officer Wei Wei is unwillingly drawn into the situation as well. As it happens, Wei Wei is also a high school classmate and friend of the two. Like a butterfly effect, events soon spiral out of control. Gradually, the death of another high school classmate, Zheng Zhengluo, more than a decade ago, comes to light again. Wei Wei begins to question the cause of Zheng Zhengluo's death and decides to investigate discreetly. To his surprise, the more he learns, the more the evidence points to Chen Qiuye as a suspect, leaving Wei Wei deeply shocked. After some hesitation, perhaps out of a sense of duty as a police officer, perhaps for his friend Zheng Zhengluo, or perhaps for Chen Qiuye, Wei Wei resolves to uncover the whole truth. This long-buried affair will bring several classmates who have not seen one another in years back together. Their younger selves and the adults they have become will meet again in a clash of human nature with no clear winner.
