The world suddenly has rules.
Those who break the rules will die.
You cannot go out after 1 am.
Don't answer the late night knock on the door.
Don't look in the mirror.
Soon after, humans were pulled into the horror dungeon.
Everyone is trying desperately to follow the rules.
Only Gu Yan found out——
There are loopholes in the rules.
And he,
Be the only one who can see the vulnerability.
