There was no mention of how Joy of Life's crown prince was demoted.

In the Qing years, the Crown Prince was deposed by the Qing Emperor and sent to Nanzhao. The specific ending was not mentioned.
In Joy of Life, the crown prince was demoted. After the Qing Emperor learned of the relationship between the Crown Prince and the Eldest Princess, he abolished the Crown Prince's position and placed the Eldest Princess under house arrest. After the Eldest Princess failed in her attempt to assassinate the Qing Emperor, the Crown Prince and Eldest Princess chose to commit suicide. The specific ending was not mentioned.
In the play, the Crown Prince was deposed by the Qing Emperor and sent to Nanzhao. The specific ending was not mentioned.
The Crown Prince's strength was very powerful during the Qing Dynasty. Even though he pretended to be dumb on the surface, he was secretly cultivating his own zhenqi and possessed strength that was not inferior to the Qing Emperor's. Through his painstaking training of martial arts manuals and the Qing Emperor's blood in his body, he successfully became a ninth-level expert. However, the specific strength level was not clearly stated. Therefore, the Crown Prince's strength was described as powerful in the Qing Dynasty, but no specific details were provided.
Joy of Life's Prince ended up committing suicide. After the Qing Emperor learned of the relationship between the Crown Prince and the Eldest Princess, he abolished the Crown Prince's position and placed the Eldest Princess under house arrest. After the Eldest Princess failed in her attempt to assassinate the Qing Emperor, the Crown Prince and Eldest Princess chose to commit suicide. Therefore, the Crown Prince did not become the Emperor.
Joy of Life Prince's ending was suicide. The specific chapter information was not in the search results provided, so it was impossible to determine the specific chapter of the Prince's ending.
Joy of Life's Prince's suicide took place in the sixth volume of the novel, and the specific chapter information could not be determined. In this plot, the Crown Prince persuaded the Eldest Princess to sacrifice herself in exchange for peace in the Crown Prince's family and prevent war from breaking out. The Crown Prince's ending was suicide. After the Qing Emperor learned of his relationship with the Eldest Princess, he abolished the Crown Prince's position and placed the Eldest Princess under house arrest.
Liu Ruirui played the role of the crown prince in " Celebrating Years."
Joy of Life's Prince's suicide took place in the sixth volume of the novel, and the specific chapter information could not be determined. In this plot, the Crown Prince persuaded the Eldest Princess to sacrifice herself in exchange for peace in the Crown Prince's family and prevent war from breaking out. The Crown Prince's ending was suicide. After the Qing Emperor learned of his relationship with the Eldest Princess, he abolished the Crown Prince's position and placed the Eldest Princess under house arrest.
In Joy of Life, the scene of the Eldest Princess sacrificing herself to the Crown Prince happened in the 22nd episode of the TV series. For the sake of the peace of the Crown Prince's family, the Eldest Princess finally chose to sacrifice herself. This plot revealed the conflict and struggle in the Eldest Princess 'heart, as well as her deep feelings for the Crown Prince. The eldest princess was a high-profile character in the drama. She was smart and quick-witted, and had a strong desire for power.