Outside the door, five people were standing.
The leader was wearing a brown executive jacket, with a white shirt underneath, about 178 cm tall, with a square face and not-so-great complexion; a few strands of white hair could be seen on his forehead.
Behind him to his left, two men each held a briefcase.
Further back, two others were dressed in plain clothes, wearing embedded earphones, their eyes bright and alert, looking around from time to time, resembling bodyguards.
The five of them, looked quite formidable.
"Who are you looking for?"
For safety's sake, Lin Chuan asked through the door.
If it were enemies, opening the door rashly could mean trouble for the few friends at home, couldn't it?
"Comrade Lin Chuan, hello, we're staff from the National Weapons Research Institute; here is my ID."
A man carrying a briefcase replied, and took out an ID, showing it to the peephole on the door, into Lin Chuan's line of sight.
The voice was very familiar.