Xia Shuangsheng is dead. How did you die? As the system said: "Host, you are now dead due to being bitten by a bug. You have been bound to me and need to travel through time and space to fulfill various last wishes so that you can get a chance to be reborn."
"What are you?"
"The system is not a thing. Huh? No, the system is a thing, that's not right... Host, you are kidding me!"
(This book is slightly satirical. Well, slightly.)