In the end, Lin Wan 'er found out that Fan Xian had killed her second brother.

In " Celebrating Years," Lin Wan 'er did not know that Fan Xian had killed her second brother, Lin Gong. Fan Xian chose to hide the truth and lie to Lin Wan 'er, making her mistakenly believe that the murderer of her second brother was someone else. He was worried that Lin Wan 'er would be heartbroken if she knew the truth and might even do something extreme. Thus, he believed that telling Lin Wan' er the truth would cause her great harm.

In the end, Lin Wan 'er did not know that Fan Xian had killed her second brother, Lin Gong. 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, according to the information provided, Lin Wan 'er did not know that Fan Xian had killed her second brother.

Lin Wan 'er learned in the TV series " Celebrating Years " that Wu Zhu had killed her second brother, Lin Gong. This discovery made her feel anger and heartache. She decided to join forces with the Qing Emperor to set up a trap to kill Wu Zhu. Although Fan Xian had stopped her in time, Lin Wan 'er's dark transformation had been confirmed. Thus, Lin Wan 'er knew that Wu Zhu had killed her second brother.

According to the information provided, Lin Wan 'er did not know that Fan Xian had killed her second brother, Lin Gong, in the TV series " Celebrating Years." 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, they did not provide any specific information on when Lin Wan 'er knew Fan Xian had killed her second brother.

In the end, Lin Wan 'er did not know that Fan Xian had killed her second brother, Lin Gong. 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.

In the original novel, Lin Wan 'er did not know whether Fan Xian had killed her brother. The search results did not mention whether Lin Wan 'er knew that Fan Xian had killed her brother. Thus, it was impossible to determine whether Lin Wan 'er knew that Fan Xian had killed her brother.

Lin Wan 'er did not know that Fan Xian had killed her second brother, Lin Gong, in the TV series " Celebrating Years." 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 didn't know that Wu Zhu had killed her second brother, Lin Gong, in the TV series " Celebrating Years." Fan Xian hid the truth of Lin Gong's death from Lin Wan 'er because he was worried that Lin Wan' er would be heartbroken and might do something extreme. Fan Xian believed that telling Lin Wan 'er the truth would cause her great harm, both physically and mentally, and their relationship. Thus, Lin Wan 'er did not know that Wu Zhu had killed her second brother.

Lin Wan 'er didn't know that Wu Zhu had killed her second brother, Lin Gong, in the TV series " Celebrating Years." Fan Xian hid the truth of Lin Gong's death from Lin Wan 'er because he was worried that Lin Wan' er would be heartbroken and might do something extreme. Fan Xian believed that telling Lin Wan 'er the truth would cause her great harm, both physically and mentally, and their relationship. Thus, Lin Wan 'er did not know that Wu Zhu had killed her second brother.

Lin Wan 'er didn't know that Wu Zhu had killed her second brother, Lin Gong, in the TV series " Celebrating Years." Fan Xian hid the truth of Lin Gong's death from Lin Wan 'er because he was worried that Lin Wan' er would be heartbroken and might do something extreme. Fan Xian believed that telling Lin Wan 'er the truth would cause her great harm, whether it was to her body or mind or to her relationship with Wu Zhu. Thus, Lin Wan 'er did not know that Wu Zhu had killed her second brother.