After watching the bodies of Cheng Tianan and the soldier vanish, Lin Qiao walked out. She never promised Cheng Tianan not to kill him. She had already found the lab, so he was no longer useful.
The entrance was hidden. Lin Qiao stood in the middle of the lobby and looked around, then walked to a wall and pressed a button that looked like the switch of a light. Human scent could only be sensed from that switch, meaning that it was often touched by humans.
Click! Once she pressed the button, the floor in the middle suddenly sank and then moved sideways, revealing a staircase. At the other end of the staircase was the door of an elevator.
Lin Qiao walked downstairs and looked at the door as she pressed the button near it. The door was soon opened, so she turned herself invisible and walked in.
