Qing Yu Nian was the mastermind behind Fan Xian's murder.

There were three people behind Qing Yuannian's murder of Fan Xian. They were the Second Prince, the Eldest Princess, and Lin Gong. The Second Prince assassinated Fan Xian because he did not want Fan Xian to control the palace treasury. The Eldest Princess did not want Fan Xian to control the palace treasury, nor did she want Lin Wan 'er to marry him. Lin Gong was the murderer ordered by the Eldest Princess to plot the assassination on Niulan Street.

The mastermind behind Fan Xian's murder in the drama was the Eldest Princess. The Eldest Princess worked with Lin Gong and the Second Prince to secretly plan the assassination on Niulan Street. Lin Gong was the murderer ordered by the Eldest Princess to obtain the token to control Cheng Jushu and smuggle him into the city. The Second Prince assassinated Fan Xian because he did not want Fan Xian to take charge of the palace treasury. The Eldest Princess wanted to help the Second Prince ascend the throne and needed to remove all obstacles.

In " Celebrating Years," the masterminds who killed Fan Xian were Lin Gong, the Second Prince, and the Eldest Princess.

There were three people behind Qing Yuannian's assassination of Fan Xian. They were the Second Prince, the Eldest Princess, and Lin Gong. The Second Prince had assassinated Fan Xian because he did not want Fan Xian to manage the palace treasury. The Eldest Princess had two reasons. She did not want Fan Xian to manage the palace treasury, nor did she want Lin Wan 'er to marry him. Lin Gong was the murderer ordered by the Eldest Princess to plot the assassination on Niulan Street. However, the search results did not explicitly mention who was the ultimate mastermind behind the scenes. Therefore, based on the information provided, it was impossible to determine who the mastermind behind Qing Yuannian's assassination of Fan Xian was.

In " Celebrating Years," the masterminds behind Fan Xian's assassination were the Second Prince, the Eldest Princess, and Lin Gong. The Second Prince did not want Fan Xian to take charge of the palace treasury. In order to assist the Second Prince in ascending to the throne, the Eldest Princess needed to remove all obstacles. Lin Gong was the murderer ordered by the Eldest Princess to plan the Niulan Street assassination.

The masterminds behind Fan Xian's assassination were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was believed to be the mastermind behind the assassination of Fan Xian on Niulan Street. His motive was to not let Fan Xian control the palace treasury and not want Lin Wan 'er to marry Fan Xian. Although there were some search results that mentioned that the Second Prince and Eldest Princess might also have participated in the plan to assassinate Fan Xian, the identity of the mastermind had not been confirmed. Therefore, based on the information provided, it was impossible to determine who the mastermind behind Qing Yuannian's assassination of Fan Xian was.

The mastermind behind Fan Xian's death in the Qing years was Lin Gong. Lin Gong was Lin Wan 'er's older brother, and also the Crown Prince and Eldest Princess's man. He had arranged for Cheng Jushu to assassinate Fan Xian on Niulan Street. His goal was to stop Fan Xian from snatching the Eldest Princess 'palace treasury and marrying Lin Wan' er. Other than Lin Gong, the Second Prince and Eldest Princess also participated in the plan to assassinate Fan Xian.

The mastermind behind Fan Xian's death in the Qing years was Lin Gong. Lin Gong was Lin Wan 'er's older brother, and also the Crown Prince and Eldest Princess's man. He had arranged for Cheng Jushu to assassinate Fan Xian on Niulan Street. His goal was to stop Fan Xian from snatching the Eldest Princess 'palace treasury and marrying Lin Wan' er. Other than Lin Gong, the Second Prince and Eldest Princess also participated in the plan to assassinate Fan Xian.

The masterminds behind the assassination of Fan Xian were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong obtained the token to control Cheng Jushu and smuggled him into the city. The Second Prince assassinated Fan Xian because he did not want Fan Xian to take charge of the palace treasury. The Eldest Princess wanted to help the Second Prince ascend the throne and needed to remove all obstacles.

There were three people behind Fan Xian's murder: the Second Prince, the Eldest Princess, and Lin Gong. The Second Prince assassinated Fan Xian because he did not want Fan Xian to take charge of the palace treasury. The Eldest Princess did not want Fan Xian to interfere with matters of the throne. Lin Gong did not want Lin Wan 'er to marry Fan Xian. This information could be found in the search results.