The Eldest Princess Li Yunrui had ordered the Northern Qi ace Lin Gong to assassinate Fan Xian.
It was said that the Eldest Princess had instructed Lin Gong to arrange for the Northern Qi ace Cheng Jushu to assassinate Fan Xian. Lin Gong was Lin Wan 'er's older brother, and also the Crown Prince and Eldest Princess's man. He obtained the token to control Cheng Jushu and smuggled him into the city. Lin Gong had ordered Cheng Jushu to kill Fan Xian because he didn't want Fan Xian to marry his sister, Lin Wan 'er. Thus, it could be said that Lin Gong had ordered the Northern Qi aces to kill Fan Xian.
Regarding the question of who had ordered the Northern Qi ace to kill Fan Xian, the following conclusion could be drawn: According to the descriptions in document 1 and document 2, the Northern Qi ace Cheng Jushu was sent to the Qing Kingdom to assassinate Fan Xian by the Northern Qi Eldest Princess and Eldest Princess 'orders. However, document 4 mentioned that the real murderers behind the scenes could be the Second Prince and the Crown Prince. They were fighting for the power of the palace treasury, and Fan Xian had become the biggest chess piece. In addition, document 7 also mentioned that Chen Pingping was related to Fan Xian's assassination. However, she did not want to kill Fan Xian. She only wanted to completely cut ties with him. In summary, although there was no clear answer, it could be speculated that the Northern Qi Great Princess, Eldest Princess, Second Prince, Crown Prince, and Chen Pingping might be related to the Northern Qi aces killing Fan Xian.
Northern Qi expert Cheng Jushu had been ordered by the Eldest Princess to assassinate Fan Xian. Cheng Jushu was an eighth-level master of Northern Qi. He acted under the Eldest Princess 'orders. The Eldest Princess learned of Si Lili's identity as a spy and instructed Lin Gong to coerce Si Lili into handing over the spy's token to mobilize Cheng Jushu to assassinate Fan Xian on Niulan Street. Thus, it was the Eldest Princess who sent the Northern Qi ace Cheng Jushu to assassinate Fan Xian.
Eldest Princess Li Yunrui had Northern Qi send the killer Cheng Jushu to assassinate Fan Xian.
Who in Northern Qi wanted to kill Fan Xian? The person behind the Northern Qi secret agents who wanted to kill Fan Xian 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 because Fan Xian had come to the capital to snatch the Eldest Princess 'palace treasury and marry Lin Wan' er. This had aroused Lin Gong's anger.
In " Celebrating Years," the masterminds behind the killing of Fan Xian on Niulan Street were Lin Gong, the Eldest Princess, and the Second Prince. Lin Gong was the elder brother of the Eldest Princess. He had worked with Wu Bo 'an to secretly plan the assassination. The Eldest Princess did not want Fan Xian to marry Lin Wan 'er, so she found Lin Gong and used him to kill Fan Xian. The Second Prince also participated.
Who in Northern Qi wanted to kill Fan Xian? The person behind the Northern Qi secret agents who wanted to kill Fan Xian 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 because Fan Xian had come to the capital to snatch the Eldest Princess 'palace treasury and marry Lin Wan' er. This had aroused Lin Gong's anger.
Who in Northern Qi wanted to kill Fan Xian? The person behind the Northern Qi secret agents who wanted to kill Fan Xian 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 because Fan Xian had come to the capital to snatch the Eldest Princess 'palace treasury and marry Lin Wan' er. This had aroused Lin Gong's anger.
The person who had ordered Si Lili to kill Fan Xian during the Qing years was Lin Gong. Lin Gong was the mastermind behind Fan Xian's assassination. He controlled Northern Qi's spy network and arranged for Cheng Jushu to assassinate Fan Xian on Niulan Street. Si Lili had also admitted this when she was interrogated by Fan Xian.
Lin Gong's assassination of Fan Xian was ordered by the Eldest Princess, Li Yunrui. In his view, it was basically impossible for Fan Xian to truly control the wealth of the palace treasury. Fan Xian's enemy was the future Emperor, the Crown Prince. After Lin Gong passed away, Minister Lin found Fan Xian and brought him to his study. He showed Fan Xian Lin Gong's calligraphy from when he was a child. When Lin Gong was eight or nine years old, he was already very good at calligraphy and had great ambitions. He hoped to make great achievements in the future and bring glory to his family. Lin Gong knew from a very young age that his elder brother was a fool and his younger sister was a phthisis patient. As the only healthy person in the family and a male, he had to live for the whole family. It was a very heavy responsibility. Before Fan Xian had appeared, he had relied on the Crown Prince and Eldest Princess. Later, the Qing Emperor arranged the marriage between Lin Wan 'er and Fan Xian. Only then did things change a little. However, Lin Gong did not know the truth about Fan Xian's background.