They had now figured out the identities of four of the ghosts, but the Knocking Ghost that followed Gu Mian was still an enigma.
"The Knocking Ghost killed Zhao Wen and Zhou Guanglei..."
"Before Zhao Wen was killed, he exhibited signs of paranoia. He suspected that the knocking was caused by humans and thus, constantly kept a close watch at night for anyone who might knock on his door. After his death, he turned into an Evil Ghost, the Peeping ghost that follows Yuwen Hao."
"The other victim, Zhou Guanglei, was also killed by the Knocking Ghost. He too showed signs of paranoia before his death, manically accusing and threatening others on the phone. He also turned into an Evil Ghost after his death, the Telephone ghost that calls Huang Yu."
"Zhao Wen, having become an Evil Ghost, then killed two people he had come into contact with: Li Dongqiang and Wang Erwa."
