At three o'clock in the morning, I was pulled into a world without daylight. This is Xu - a parallel space governed by strange rules. The only rule for survival is absolute obedience to the rule book. But I discovered Article 13 that was not in the manual: the night watchman can enter the restricted area at midnight. And in the restricted area, there are hidden the last pictures of all the missing people before they were erased. I am silence, the last human night watchman in this ruin. While other gamers were still interpreting the rules word for word, I already knew that the real danger was never written in the rules.