Deep in the Mountains.

In the early 1990s, a small-town checkpoint officer, Yao Sichen, becomes entangled in a missing truck case due to a canceled fine. To clear up the case, he spares no effort in investigating in Maniao River Village, dealing with the truck driver Yang Zhaowei and his daughter Yang Ge, village chief Zhang Changchun, security chief Chen Yongjin, Yan Xue, and the serial killer Ge Wenyong. In the end, Yao ultimately clears up a string of murder-for-profit crimes.