Seven elevators were available for people to take to the second-floor lounge.
Qin Zhi'ai took number one, and Liang Doukou took number five.
The north entrance of the banquet hall was not far from the elevators but, just 20 feet away, one of the guests stopped Gu Yusheng to say hello. As he courteously stopped, he glanced at the red numbers above the elevators.
Having seen them both get in separate elevators, Gu Yusheng watched as Qin Zhi'ai and Liang Doukou stopped on the second floor.
He quietly looked back at his guest, exchanged a few words with him, and then dashed to the elevators and pressed the up button.
When the door opened, Gu Yusheng stepped in and pushed the button for the second floor.
As Gu Yusheng exited the elevator, he saw someone walking down the corridor and disappear when they turned right.
