Two months ago, my brother left the house.
No matter how much I tried, no one had seen my brother.

In the meantime, I got a call from the police station that my brother had been found.
CCTV footage showed that the younger brother entered a secluded building and was nowhere to be found after that.

I found my brother and entered the building.

As I slowly walked forward, looking around, I tripped over something.

Lifting the carpet, a small doorknob appeared.

As if possessed, I opened the door and went down.