Hu Ba Yi and Wang Pang Zi had planned to go abroad with Shirley Yang. However, they were entrusted by Professor Chen to travel to the Coral Spiral with Mr. Ming to search for the Qin Emperor's Bone Mirror. They befriended Ruan Hei, Gu Cai, and Duo Ling on Coral Temple Island. Together, they set sail. One night, they were sucked into the underwater cave of Guixu. In despair, Hu Ba Yi and Shirley Yang decided to risk their lives using the Sun-shooting wooden mechanism to lead everyone out of Guixu.