Professor Chen commissions Hu Bayi and his team to explore the South China Sea, where they hire Ruan Hei and his apprentice to search for the Qin Emperor's Bone Mirror on the Trident. Their journey takes them to the Coral Temple Island, and eventually to Guixu, where they recover the mirror from a shipwreck. Hu Bayi also learns of a complicated past between Ruan Hei and Duoling. Upon returning to their camp, a sudden encounter occurs between Uncle Ming and a mysterious figure.