In Haizhou City, where prosperity and shadow intertwine, an old case that has been buried in dust for 15 years - "Case X" lingers like a nightmare. At that time, the famous philanthropist Zhou Shichang and his wife were brutally murdered. A strange ceremony was arranged at the scene. An important list involving secret transactions in the political and business circles and the key token "Tears of the Poseidon" sapphire were stolen. The case was hastily concluded and the real murderer was at large. However, police officer Lin Mo left the police force with trauma due to the sacrifice of his partner Qin Feng and the many doubts in the case...
