Using that oil painting as reference, Chen Shi looked for the specific location in the video. He pointed to an area of the floor and said, "Here."

Peng Sijue took out the luminol reagent and sprayed it there. The luminol reagent was very sensitive and couldn detect even a drop of blood that falls into a tank of water. No matter how many times this area was wiped, there would be residues.

An irregular blue fluorescent stain appeared on the ground. Chen Shi excitedly said in a lowered voice, "Found it!"

"Sampling!"

Peng Sijue took a sample with a cotton swab dipped in alcohol. Chen Shi heard footsteps. Looking around, there seemed to be someone passing by the door on the other side of the corridor. The person opened the door and the two were very frightened because the investigation wasn’t a formal one. If found, it would be extremely disadvantageous to them.

The big hand...