Song Lili entered the men's restroom, looked around, and found nothing. Therefore, she checked each restroom stall and eventually discovered a foreign object in the water tank of the last stall.
Inside a plastic bag was a small palm-sized, square device similar to a controller.
Song Lili opened the plastic bag and took a closer look; there was a small screen on the device that was displaying a countdown.
Upon seeing this, she already knew what it was.
With her eyebrows knitted together, she remembered reading about it in a book—it was a mini-bomb control device with dozens of telecommunications connection points, meaning it could detonate dozens of mini-bombs simultaneously.
However, there was a limited range between the controller and each mini-bomb.
Therefore, the placement of the controller must have been precisely calculated to ensure all mini-bombs would explode when the countdown ended.
