Ji Youli left with a plastic card and tools from his small bag. As he reached the doorway, ready to help the neighbor girl close the door, he stopped abruptly, staring at the door frame.
The door frame of the security door wasn't the simplest smooth structure; further past the keyhole, there was a vertical concave structure running up and down, and the corresponding edge of the door had a convex structure.
With the addition of shock absorption strips, not only could it reduce the noise and collision when closing the door, but it could also enhance the tightness, greatly improving the sealing and soundproofing.
It was made of 304 stainless steel, with a color coating applied, and judging by the size, it seemed custom-made, likely costing eight to ten thousand.
These details flashed through his mind quickly.
He glanced down at the plastic card in his hand, seeing no noticeable bends, and this type of card certainly couldn't pry open such a door.
