We ran out, looking for the dean when someone shouted that they found him. A professor followed the dean out of the opposite lecture building. As it turned out, he was using the restroom on the other side.

Looking at the white-haired dean, a sliver of doubt crossed my mind! I deliberately glanced at his hand, only to find his skin as old as bark before dismissing my suspicions.

Deng Chao's voice rang once more, "Next comes the fifth test. I've hidden a clue on the body. You have 15 minutes to find the right place and answer the question. Good luck!"

I returned to the lecture building, rushed into the classroom and found a keychain hanging on the victim’s belt. It looked very familiar so I looked down at my own pants...