Based on the information provided, it was impossible to determine why Lin Wan 'er wanted to kill Fan Xian.
Lin Wan 'er's father, Lin Gong, wanted to kill Fan Xian because after Fan Xian came to the capital, he planned to seize the Eldest Princess' palace treasury and marry Lin Wan 'er. This caused Lin Gong to be angry and dissatisfied. He felt that Fan Xian's conduct was not good enough to be with Lin Wan 'er. In addition, the Eldest Princess also supported Lin Gong's decision because Fan Xian's actions had an impact on the Crown Prince's power and threatened the Eldest Princess 'rights. Thus, Lin Gong decided to arrange for Fan Xian's assassination to protect his sister Lin Wan 'er's interests.
Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he didn't agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person who was not suitable to be his sister's husband. He had once told Lin Wan 'er," Even if it was against the Emperor's will, he could not let his sister marry someone like Fan Xian." For this reason, Lin Gong had always been hostile toward Fan Xian and had tried to assassinate him. In the end, Lin Gong did not succeed in killing Fan Xian. Instead, he killed Fan Xian's good friend, Teng Zijing.
Lin Wan 'er's second brother, Lin Gong, killed Fan Xian because he did not agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person and was not suitable to be his sister's husband. Lin Gong had once told Lin Wan 'er that even if it was against the Emperor's will, she could not let her sister marry someone like Fan Xian. However, Lin Wan 'er did not know that Fan Xian had killed her second brother. In order to protect Lin Wan 'er's mental and physical health, Fan Xian chose to hide the truth of Lin Gong's death and lied to Lin Wan' er to make her mistakenly believe that the murderer of her second brother was someone else. Thus, Lin Wan 'er did not know that Fan Xian had killed her second brother.
Lin Wan 'er liked Fan Xian because they fell in love at first sight in " Celebrating Years." Their acquaintance began with an accidental meeting. When Lin Wan 'er was secretly eating chicken drumsticks in the Temple, Fan Xian had just arrived in Jingdou. The two of them had encountered a special situation at a special time. This kind of love at first sight gave them a strong attraction and a feeling of missing each other. The love between Lin Wan 'er and Fan Xian was also pure. They did not care about each other's identity or background. What they pursued was the harmony of their hearts and pure feelings. Fan Xian's feelings for Lin Wan 'er would not change until death. Lin Wan' er was also willing to accompany Fan Xian and never leave him. Thus, Lin Wan 'er liked Fan Xian because of the special love at first sight and pure emotional connection between them.
In the end, Fan Xian married Lin Wan 'er. Although Fan Xian did not marry Lin Wan 'er in the TV series " Celebrating Years," in the original novel, Fan Xian chose Lin Wan' er as his wife and held a grand wedding. They had fallen in love at first sight and had a son, Fan Liang. Thus, it was certain that Fan Xian had married Lin Wan 'er.
Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he didn't agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person and was not suitable to be his sister's husband. Lin Gong had once told Lin Wan 'er that even if it was against the Emperor's will, she could not let her sister marry someone like Fan Xian. However, Lin Gong wasn't the mastermind. He was just following orders. There was a bigger conspiracy behind it. In the end, Lin Gong died in the play, and Fan Xian's enemy, Wu Zhu, killed Lin Gong for Fan Xian to protect the relationship between Fan Xian and Lin Wan 'er. So, Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he did not agree to their marriage, but he was not the mastermind behind it.
Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he didn't agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person and was not suitable to be his sister's husband. However, Lin Gong wasn't the mastermind. He was just following orders. There was a bigger conspiracy behind it. In the end, Lin Gong died in the play, and Fan Xian's enemy, Wu Zhu, killed Lin Gong for Fan Xian to protect the relationship between Fan Xian and Lin Wan 'er. So, Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he did not agree to their marriage, but he was not the mastermind behind it.
Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he didn't agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person who was not suitable to be his sister's husband. Lin Gong had once told Lin Wan 'er that even if it was against the Emperor's will, she could not let her sister marry someone like Fan Xian. However, the specific reason Lin Gong wanted to kill Fan Xian was not mentioned.
Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he didn't agree to his sister marrying Fan Xian. Lin Gong thought Fan Xian was a sloppy person who was not suitable to be his sister's husband. Lin Gong had once told Lin Wan 'er that even if it was against the Emperor's will, she could not let her sister marry someone like Fan Xian. However, Lin Gong wasn't the mastermind. He was just following orders. There was a bigger conspiracy behind it. In the end, Lin Gong died in the play, and Fan Xian's enemy, Wu Zhu, killed Lin Gong for Fan Xian to protect the relationship between Fan Xian and Lin Wan 'er. So, Lin Wan 'er's brother, Lin Gong, wanted to kill Fan Xian because he did not agree to their marriage, but he was not the mastermind behind it.
Fan Xian had no intention of killing Lin Gong. Lin Gong's death was because Fan Xian's friend Teng Zijing had been killed. Fan Xian had pursued Lin Gong for revenge. Fan Xian loved Lin Wan 'er deeply, and his heart wavered. But in the end, he did not personally kill Lin Gong. Under Fan Xian's confused state of mind, Wu Zhu decided to kill Lin Gong for Fan Xian. Fan Xian didn't ask to kill Lin Gong. He even felt guilty and took good care of Lin Gong's sister in the later parts of the plot. Thus, Fan Xian had no motive to kill Lin Gong.