【Don't open the door!

【Don't go downstairs!】

In the moment just before I was about to open the door handle,

404, who had never spoken in the group before, suddenly sent me a private message.

【501, both husband and wife are dead.

【There's a serial killer hiding among the neighbors.】

Cold sweat covered my whole body.

I hadn't told anyone.

How did he know I was about to go out?