He was hurt so badly while he was alive, and his anger was still lingering after his death, so he was bound to an inexplicable system?
Shen Chi has only one purpose, and that is to complete the tasks in each world, and then resurrect back to his own world to take revenge!
Shen Chi: "You are fake! You are just a virtual character in the mission world!"
Him: "I'm serious. If you don't believe me, just touch me."