I Fix Air-Conditioner

The hearse with the weird odor slowed to a stop before the entrance. The sound of pebbles could be heard bouncing on the ceiling. There were footsteps coming from the corridor, and there seemed to be someone sawing next door. The door knob to the room rattled slightly, and the faucet in the bathroom kept dripping even though it had been screwed shut. There was a rubber ball that rolled on its own underneath the bed. Wet footsteps started to surface one after another on the floor. 
At 3 am, Chen Ge held a cleaver in his hand as he hid beside the room heater. The call he was trying to make was finally answered. "Landlord, is this what you meant by 'the house can be a little crowded at night'‽"

Millman97

My House of Horrors

Lonelytree

Daoist6fubtiW

"For the sake of the child's future recovery and your personal safety, please be careful."

After hanging up the phone, Chen Ge leaned against the toilet's wall. His mind was a clotted mess. If the killer was not Fan Yu, then it had to be Fan Yu's aunt. They were the prime suspects but also the victims' closest family.

In any case, it is certain that Fan Yu's aunt is hiding something from me. Something else must have happened that rainy night several years ago.

Their closest family turning into their killer, this was a mystery that stumped Chen Ge.

The crime scene was at Mu Yang High School, perhaps I can find some clues here.

How Do I Complete This Mission?