C247 Older persons and young people

In a basement in Demonic City, an old man was soaking in a multicolored liquid. The liquid had already surpassed the old man's head. If the liquid was replaced with a white one, then it must have been a sample made from formalin in some laboratory.

However, all of a sudden, the old man inside the glass door opened his eyes. In this pitch-black environment, the old man opened his eyes