Chapter 631: Secretly Setting up a Trap

"Who's that?" Zhang Wanguo shouted as he rushed out the door.

No one answered.

"Go take a look." It was inconvenient for Zhang Wanguo to hold the door because he was holding a syringe in his hands. So, he told one of the guys to do it.

The guy swayed over to the the door and asked once again, "Who is it?" He pulled the door open as he yelled.

Zhang Wanguo had only opened up a small gap, as he'd done earlier. This man, however, was not as cautious as Zhang Wanguo. He brazenly opened the door wide open.

No one was at the door.

He stuck his head outside, and peered left and right. There was no one around either.

"They probably knocked on the wrong door." He thought nothing of it and closed it shut.

"Knocked on the wrong door?" Zhang Wanguo inquired doubtfully.

"This isn't some regular house, how could anyone knock on the wrong door? Even if he did knock on the wrong one, he wouldn't have left without saying a word, right?"