A mysterious body by the Tong River resurfaces clues to a five-year-old case, bringing together three childhood friends—now a criminal investigator, a detective, and an undercover agent. As they pursue the truth behind multiple unsolved crimes, they navigate hidden dangers and unravel deep conspiracies.

Cast: Jing Boran, Cai Wenjing, Qin Junjie, Zhao Xun, Du Yuan, Xu Honghao