Lin Gong took Si Lili's waist token. Lin Gong used this token to order Cheng Jushu to assassinate Fan Xian. Lin Gong forced Si Lili to hand over the spy token. After getting the token, he ordered Cheng Jushu to assassinate Fan Xian on Niulan Street.
Si Lili's token was taken by the Second Prince. Si Lili was a spy in Northern Qi and was responsible for gathering intelligence on Qing Kingdom. After the failed attempt to assassinate Fan Xian on Niulan Street, Si Lili was escorted back to Jingdou. Under the torture of Chen Pingping, Commissioner of the Overwatch Council, Si Lili confessed her identity and mission, but she hid the information she had on Xiao En. Later, Si Lili was imprisoned by the Qing Emperor, and the token in her hand was taken away by the Second Prince.
It was Lin Gong who asked Si Lili for the token.