Meng Chao's heart instantly leapt into his throat.
Zhou Chong whispered by his side, "It's fine. The secret police implanted the most advanced biochemical chips in the two robbers. The raw materials were taken from crystalized neurospheres and the periosteum of the monster brain. They won't be discovered by metal detectors."
Just as he said, after some rustling sounds, Big Brother Knife snorted softly and said, "Come in."
The two robbers were finally relieved. They quickly said, "Thank you, Big Brother Knife! Thank you!"
Then came the sound of a door closing and locking.
Based on the sounds, the door was very thick. Some kind of armor might have been installed in it. It had at least three locks and might have high-voltage electricity circuits and explosives in it.
Based on the title they used to refer to the man and the characteristics of the person's voiceprint, the handler's identity was found immediately.