The story takes place in two parallel universes named Yuan and Yi, where people share the same life and death. Nian Yang Xiao came from the Yuan World to save his true love, Kong Ling Hui and crossed the border to the Yi World in search of the killer who assassinated his love. In the Yi World, however, he and Kong Ling Hui were enemies. Kong Ling Hui tried everything to kill him. At the same time, the mysterious girl Yong Er, the romantic street gangster, the cold-faced police officer Nuo Dun and others appeared one after another, each accompanied by a complex case. The involvement of Nian Yang Xiao made the cases more complicated and confusing. (Source: Youku YouTube) ~~ Adapted from the donghua "Hua Jiang Hu Zhi Huan Shi Men Sheng" (画江湖之换世门生) by Beijing Ruosen Digital Technology Co., Ltd. (北京若森数字科技有限公司).