The person who had used Northern Qi's spy to kill Fan Xian was Cheng Jushu. Cheng Jushu was an eighth-level ace in Northern Qi. He acted under the Eldest Princess 'orders and was ordered by the Eldest Princess 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 Eldest Princess Li Yunrui had ordered the Northern Qi ace Lin Gong to assassinate 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.
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.
There were many reasons why Northern Qi wanted to kill Fan Xian. First of all, Shen Zhong believed Fan Xian was a threat to Northern Qi. He was worried that Fan Xian's existence would bring trouble to Northern Qi, so he planned the assassination. Secondly, Shen Zhong and Shang Shanhu had a grudge. Shang Shanhu's foster father had died in Shen Zhong's pursuit, so Shen Zhong hoped to use Fan Xian's death to satisfy Shang Shanhu's desire for revenge. In addition, the Eldest Princess Li Yunrui had also instructed Northern Qi to send the killer Cheng Jushu to assassinate Fan Xian. Fan Xian had come to Jingdou to rob the Eldest Princess of her palace treasury and marry Lin Wan 'er. This had aroused the Eldest Princess's anger. In short, Northern Qi wanted to kill Fan Xian because they believed Fan Xian was a threat to their interests or to satisfy their personal desire for revenge.
Chen Pingping did not want to kill Fan Xian. On the contrary, Chen Pingping had been working hard to help Fan Xian and hoped that he could live a better life. Chen Pingping even wanted Fan Xian to take over the Inspection Council and help him become Emperor. His nurturing and protection of Fan Xian surpassed the relationship between master and disciple. It was more like the support of an elder to a younger relative. Thus, Chen Pingping did not want to kill Fan Xian.