A memorial service for Fei Ke brings together female journalist He Shan and four strangers who are invited. They all share undisclosed pasts with Fei Ke, but they discover that the Fei Ke they knew is not the same person. Who is Fei Ke really? As they look back, the group gradually uncovers the truth about Fei Ke.

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.