Private Top Secret Files

My name is Li Fan. Because I wanted to earn tuition, I found a summer job as a security guard in an office building. Everything was normal at first, but the leader told me three rules: first, the elevator must be closed at twelve o'clock in the evening; second, after twelve o'clock, no matter whether it is a living or dead person knocking on the door, it cannot be opened under any circumstances; third, if there is no problem with the first and second, there is no need to tell me the third... But who would have known that my life trajectory would turn into another bizarre and unknown place within these three taboos...