"Knock, knock, knock!"
Across from the Fenghua Building, Guan Zu raised his hand and knocked on the door of a seemingly ordinary residential flat.
This was the Joint Operations Command Centre for the Criminal Intelligence Bureau and the Commercial Crime Bureau.
The sudden knocking instantly put the operatives from both teams inside on alert.
Every police officer taking part in this operation had been issued a key to the flat.
Someone knocking clearly meant it was not one of their own.
"Who is it?"
As footsteps approached, a low voice reached Guan Zu through the door.
Guan Zu did not answer. He simply lifted the Appointment Certificate on his chest and held it up to the peephole for his colleague inside to inspect.
"Creak!"
The old hinges creaked as the officer inside opened the door and stepped aside for Guan Zu and the others.
Although the Police Force's Appointment Certificates were not impossible to forge, under the present circumstances, this clearly could not be someone up to no good.
After all, the three Fenghua International shareholders they were investigating were only involved in financial crimes.
Even if caught red-handed, they would spend a few years in prison at most.
There was simply no need to send assassins to attack the joint Action Group.
Most importantly, the other side could not possibly have that kind of nerve.
"Hello, colleague. Senior Inspector Guan Zu, Operations Security Department, National Security Department!"
Guan Zu clipped his Appointment Certificate back onto his suit's breast pocket and extended his right hand to the colleague before him with a warm smile.
As Sir Kwan's First Disciple, Guan Zu had naturally inherited his master's friendliness toward their fellow officers perfectly.
The National Security Department held extensive authority, but none of its officers had ever displayed a tendency to