Chang An in the Tang Dynasty of China (618-907): The demon star is passing through the sky, calamity is about to befall the Tang Dynasty – because of a woman. Skilled in martial arts and war tactics, Princess Li Cheng Ge sets out to avenge her family and take back the throne In the year 626 C.E., the Tang Dynasty faces upheaval following the successful Xuanwu Gate Incident, a coup orchestrated by a cunning prince. During the chaos, Li Chang Ge’s family is slaughtered, but she manages to escape. Determined to avenge her family, she raises an army to challenge the new Emperor, Tai Zong. However, her plans take an unexpected turn when she’s defeated by the Eastern Turkic Khaganate forces. General Ashile Sun, her conqueror, keeps her as his strategist, and as they form a powerful military partnership, romantic feelings begin to bloom between them.