Introduction: The film tells the story of a battle between two imperial court officials. The emperor General Cha was sent to take charge of the famous secret underwater base. Father Ruan sent a killer to commit a crime and sneaked into the base, while General Che tried to find the assassin and disintegrate Father Ruan’s conspiracy. The two forces launched a wonderful game around the secret underwater base. As two chess pieces, Shiqi and Tangfang are both enemies and sisters, and the grievances and hatred behind them are revealed.