Act One: The traitor betrays the intelligence station, eight people sit in a secret room, and only one can survive. Someone slapped the table and shouted: Who is the mole? When the gun was pointed at Yu Yinfeng, he didn't open his mouth to explain, but just counted silently for three seconds. Three seconds later, the reflection of the sniper scope outside the window shone right into the traitor's eyes - that was when he made a gesture that only the sniper could see.
Act 2: Yu Yinfeng took off his blood-stained suit and pointed at the office vent: "The ventilator blades rotated three times more." He casually reported how many times the stationmaster went to the toilet three days ago and who he talked to on the phone last time. The entire intelligence station was blown away - this person installed a speedometer in a place like this?
Act Three: When he took over as the head of the intelligence station and burned the high-level list in public, military vehicles had surrounded the building - what he activated was the "nail" lurking deepest in the military command.
