Hua Rong and Qin Shangcheng went through many hardships and finally became lovers. Just as they were getting married, a royal decree ordered Hua Rong to marry a hostage from a neighboring country. In order to save the world, Hua Rong decided to temporarily "secretly marry" Qin Shangcheng and lead the Tianchu envoys to the southern wilderness to "marry". Along the way, the island owner and his wife were in an "underground love" and their "rival" Duanmu Bai was crazy about breaking up the couple. Zhang Xian and Qian Dayou escorted them hilariously. The original team started a new interesting and dangerous adventure in the rivers and lakes.