C144 Numbers on the wall

Therefore, Xiao Ding used his flashlight to search the room carefully. This time, he was no longer searching those eye-catching places, even the walls were not spared. He was carefully inspecting every inch of the walls.

Finally, he found some clues on the wall by the door. Rather than calling it a clue, it would be more accurate to call it scribbling. These were two rough lines