After sticking to the rooftop floor and listening for ten seconds, Lu Chong was sure that his actions just now did not alarm anyone, and he didn't even hear the sound of people moving on the fourth floor.

Lu Chong flashed to the closed door on the rooftop and pushed it gently, only to find that it was the same as the building opposite, and someone had bolted it from the inside.

Lu Chong stretched out his hand and touched his body, and a folded multi-functional Swiss Army knife had already appeared in his hand, which could be regarded as their living habits, as long as there were conditions, they would bring a spare one wherever they went.

Lu Chong pulled out a small drill bit designed to pull the wooden plug from the Swiss Army knife, stuffed it diagonally through the gap in the door, and pulled it back with the small barb at the tip of the small drill bit hanging the iron bolt.

As soon as he moved, Lu Chong was overjoyed, his luck was indeed good this time, the other party did not add a lock to the door bolt, Lu Chong adjusted the angle and strength, and soon opened the door of the rooftop silently from the outside.

Descending the stairs to the fourth floor, as he could see on the ground, the fourth floor of the entire building was unlit. Out of caution, Lu Chong still bowed over and quickly inspected the fourth floor. It is true that no trace of people was found, but he found an unexpected surprise, this fourth floor turned out to be used by Yu Jingpeng and others to store weapons.

Through the faint starlight coming in from the window, Lu Chong could see that this place should have been turned over once before, and several of them should be equipped with AK47