Reality Instance

At midnight, a non-deletable app suddenly appears on Shen Yuan's phone. [Instance: Midnight Bus.] [Task: Arrive at the thirteenth stop.] [Reward: Seven days of life.] He boards a bus that should have been out of service. There are only twelve people on the bus, but the number on his phone shows— [Thirteen.] Someone tells him not to look back. Someone tells him not to answer to his name. And what Shen Yuan doesn't know is... there might not have been twelve people on this bus at all. Even less does he know that from the moment he first entered the instance— the instance has already begun to remember him. — Description from novelcodex.org