Yan Donghuang, the illustrious Grand Princess of Qingluan, is ambushed by her husband, Sheng Jing'an, on their wedding night and forced to swallow the Seven-Day Heartbreak Poison. She is also forced to accept Shen Yun as his co-wife. After seeing through the schemes and betrayal of the emperor and empress dowager, she refuses to sit back and await her fate, mobilizing the Qingluan Army to fight back. Yan Donghuang investigates corrupt officials and wrongful cases, exposes numerous conspiracies, and fights injustice with her limited time remaining. She stays true to herself and seeks justice for herself and the soldiers under her command, determined to break free from the shackles of imperial power and its schemes.