The daughter of Li Jiancheng, the first crown prince of the Tang Dynasty, her parents and siblings died in the Xuanwu Gate Incident. After learning that her parents were killed, Changge, who was full of resentment, escaped from the palace with her superb martial arts, and during the pursuit, she faked her death by falling off a cliff., later on, she disguised herself as a man and concealed her identity. She only wanted to avenge her parents. In the conflict of interests between her family and the country, she finally gave up revenge and became a messenger of national reconciliation with Ashley Falcon.