Star Ember: the Thirteenth Passenger

The last subway train stopped in the river-crossing tunnel, and the announcement suddenly sounded: This carriage is limited to 12 people, please confirm the identity of the thirteenth passenger. Gu Chenzhou counted and found that there were only twelve people in the carriage. Three seconds after the lights went out, a line appeared on the back of his hand: Vote for the superfluous ones, and the countdown begins. From that night on, missing records, suspended routes, and erased passenger lists all found him one by one. Some say he is a survivor, others say he is the source of pollution. Gu Chenzhou just wanted to live, but found that these anomalies were not supernatural, but a set of recycling procedures left behind by a fallen civilization.