Against the fictional backdrop of the Great Jin dynasty, Qin Jinzhi, a noble princess who appears arrogant and domineering but actually bears an imperial mandate and a cold poison, uses a prodigal persona as the Emperor's "blade" to purge the aristocratic families. After returning to the capital, she disciplines a prodigal prince, subdues secret agents, schemes to disrupt the marriage alliance between the Cui and Pei families, and brings down corrupt officials. In the process of churning the court politics, she becomes emotionally entangled with aristocratic scion Pei Jinnian and others, ultimately gradually breaking the aristocratic monopoly and controlling her own destiny.