The assassin Yan Po wipes out all 18 members of the Huang family in one blood-drenched night, stealing the secrets to shape-shifting magic in the process, subsequently disappearing without a trace. One girl from the Huang family survived, vowing to take revenge. 70 years later, the most popular phrase in Chang’an is “As the mantis stalks the cicada, behind them will lurk the Golden Sparrow. I shall not rest until Yan Po appears.