In order to find the true culprit behind the Niulan Street assassination, Fan Xian, with Wang Qinian's help, tracked Si Lili down and brought her back to Jingdou. Through a series of operations, Fan Xian obtained the right to personally interrogate Si Lili. He interrogated Si Lili to find the mastermind behind the assassination. At first, Si Lili refused to reveal the mastermind. Fan Xian used special methods to pressure her. In the end, Si Lili revealed that the mastermind was Lin Wan 'er's second brother, Lin Gong. He was a member of the Prince's faction and the assassination was likely ordered by the Prince.

In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
Si Lili of Joy Life told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
Si Lili of Joy Life told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In Joy of Life, Si Lili told Fan Xian that the mastermind behind the scenes was Wu Bo 'an.
In the dungeon, the questions Fan Xian asked Si Lili included that she came from Northern Qi, had been ordered to hide, had the power to dispatch her colleagues in Jingdou, and was not subject to any restrictions other than the orders of the Northern Qi royal family. In addition, Fan Xian also asked who was behind the Niulan Street assassination. He suspected that Si Lili might have leaked the information to someone else and hoped to find out the truth to avenge Teng Zijing. Si Lili compromised under Fan Xian's threat and told him the truth, including that the mastermind of the assassination was Lin Gong.
Si Lili said that Fan Xian's murderer was Lin Gong.