A cunning emperor meets a loyal bodyguard with explosive fighting skills. Wei Zheng has only ever learned one phrase in his life: "Your Majesty, who are you going to kill tonight?" From the age of eight, when he was placed in the Ninth Prince's residence as a guard, his life belonged to Xiao Jingyan. He shielded him from arrows, killed for him, and warmed his bed. Later, when Xiao Jingyan became emperor, the entire court wondered: what is it about Commander Wei, who always carries a knife to court, that earns him such imperial favor?