Zhou Jianjun works as an electrician in a community and earns 3,500 yuan a month. His wife has run away and his son is at home. That day after he finished repairing the circuit, he saw a notice in the corridor. Others said they didn't see it. The sign read: Don't go to the basement tonight. He didn't take it seriously, but there was a knock on the door in the basement in the middle of the night. The next day, the old gatekeeper died. The notice appeared again, this time it read: At 11 noon tomorrow, the gas in Unit 3, Unit 602 will leak.
