According to Douban film query, in the film Detective Di Renjie 3, Xiang Mei was Wang Kai's confidant and was placed undercover in the underworld. During the investigation, it was found that Honggu was an undercover of the underworld. Honggu is a senior member of the black society and can provide valuable information. After Hong Gu's identity was revealed to Mei, her actions were restricted. Honggu was captured by He Di, and the underworld was also hit hard.