Delivering Express Every Day to Extend Life

In order to extend his life, the courier Song Xing had to help the system complete the task of delivering couriers and travel through time and space. Help customers fight zombies in the apocalyptic world, and help customers play games in the game world... But everything didn't seem that simple. Song Xing felt that he was involved in a huge mystery. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.