When the Liangshan outlaws are attacking Dongping Prefecture , Shi Jin says that he knows a prostitute , Li Ruilian , in the city .
Shi Jin can make use of Shi Jin 's acquaintance Li Ruilian her to serve as a spy for Liangshan .
When the Liangshan outlaws are attacking Dongping Prefecture , Shi Jin says that he knows a prostitute , Li Ruilian , in the city and he can make use of his acquaintance with her to serve as a spy for Liangshan .