During the Wanli era of the Ming Dynasty, Ding Jian, an officer of the Northern Branch of the Embroidered Uniform Guard, investigates a case of stolen firearms. In the process, his wife Su Qing is kidnapped by bandits. Ding Jian is forced to assassinate the Third Prince, leading to his wife's wrongful death and branding himself as a traitor. Seeking revenge and answers, he teams up with his friend Li Jinzhong, uncovering the truth step by step, only to realize that he himself is just a pawn in a larger scheme...