The masterminds behind the killing of Fan Xian at Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess.

The masterminds behind the assassination of Fan Xian on Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was the one who 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 assist the Second Prince in ascending the throne and needed to eliminate all threats. The three of them finally arranged the assassination of Fan Xian on Niulan Street.
The masterminds behind the killing of Fan Xian at Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was Lin Wan 'er's brother and also the Crown Prince and Eldest Princess's man. He had arranged for Cheng Jushu to assassinate Fan Xian on Niulan Street. The reason the Second Prince and Eldest Princess were involved was because they didn't want Fan Xian to manage the palace treasury and didn't want Fan Xian to marry Lin Wan 'er.
The masterminds behind Fan Xian's assassination on Niulan Street 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 had assassinated Fan Xian because he did not want him to take control of the palace treasury. The Eldest Princess had done so to assist the Second Prince in ascending the throne. She needed to eliminate all threats.
The masterminds behind Fan Xian's Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was the one who 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 assist the Second Prince in ascending the throne and needed to eliminate all threats.
The masterminds behind Fan Xian's Niulan Street assassination were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was the one who obtained the token to control Cheng Jushu and smuggled him into the city. The Second Prince had assassinated Fan Xian because he did not want Fan Xian to be in charge of the palace treasury. There were two reasons why the Eldest Princess was involved. Thus, the mastermind behind the assassination of Fan Xian on Niulan Street was planned by these three people.
The masterminds behind the assassination of Fan Xian on Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess. Lin Gong was the mastermind behind Fan Xian's assassination, and the Second Prince and Eldest Princess were also involved in this assassination plan. Their motive was not to let Fan Xian control the palace treasury and to stop Fan Xian and Lin Wan 'er's marriage. Thus, the masterminds behind the assassination of Fan Xian on Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess.
The masterminds behind the assassination of Fan Xian on Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess.
The masterminds behind the assassination of Fan Xian on Niulan Street were Lin Gong, the Second Prince, and the Eldest Princess.
The masterminds behind the assassination of Fan Xian on Niulan Street 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. And Lin Gong was the murderer ordered by the Eldest Princess to plan the assassination on Niulan Street. Therefore, according to the information provided, the mastermind behind the assassination of Fan Xian on Niulan Street was the Second Prince, the Eldest Princess, and Lin Gong.
The masterminds behind the Niulan Street assassination were Lin Gong, the Eldest Princess, and the Second Prince. 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. In order to assist the Second Prince to ascend the throne, the Eldest Princess needed to eliminate all threats, so she also participated in the plan. However, the identity of the mastermind had yet to be confirmed. Therefore, there was no clear answer as to who was the mastermind behind the Niulan Street assassination.