He didn't even bother with the lights, using the illumination from the corridor, he peeled the "Work and Rest Schedule" off the wall! Then he hurried back to the ward he had just left, hastily placed his hand on the wall, and started searching above the scratches.
Finally, he touched a strange spot, a peculiar sticky sensation, the kind left behind only after tape had been pulled off. Furthermore, starting from this spot, he found three other sticky "tape residues," perfectly positioned at the corners of an A4 paper.
Dr. Zhang knew he had guessed right, so he couldn't wait to pick up the "Work and Rest Schedule" in his hand, align it with the four corners, and affix the paper to the wall once again.
...Just like that, the wall was restored to its "original state."
He looked at the wall which was now much more pleasing to the eye and took a deep breath.
