The water of the Yangtze River begins in Kunlun and ends in Dongming. There are countless people who are nourished by the river and turn into demon spirits. Sui Yuan, a scholar who went to Beijing to study, stumbled into the trap of "Mandarin Duck Hotpot" by the koi fish demon Jiang Xiaoyu and fell in love with her. The demon slayer Dongfang Xingyun rescued Sui Yuan, but found that all this was caused by the ancient beast Henggongyu. The river was boiling, the people were struggling, and a battle to save the common people and love started on the Wujiang River...