This is not a weird story

This seemingly normal world hides bizarre "weird stories".
Strange story 1: From now on, no matter who calls you from behind, don’t look back, otherwise the consequences will be serious.
Strange story 2: Play hide and seek alone in an abandoned room. After hiding, you will find that someone is really coming to find you.
Weird story 3: Don’t go up to the rooftop to dry clothes alone at midnight.
At the beginning of the strange story, some people encountered it, some escaped, some were curious, and some questioned...
Until one day, it completely broke out!