My System Is Unreliable, What To Do?

Feng Yongrui had just died, and when he opened his eyes, he found himself bound to a "System", allowing him to travel to many worlds and complete missions. At first, Feng Yongrui was elated.

Would this System help him conquer worlds, find his true love, or reach the pinnacle of life?

System: Heh, dream on.

...Because of his System, Feng Yongrui found out that when he traveled from one world to another, he would always find himself in difficult situations...

Join Feng Yongrui as he goes from one world to another, and, against all odds, complete his missions.

***
First world:

System: Oops, I lost the information about this world~
Feng Yongrui: ...Then how am I supposed to do my mission?

Second world:

System: Host, the System has accidentally transferred you into the wrong person~
Feng Yongrui: ...You don't need to sound so happy, right?

Third world:

System: Host, unfortunately it seems some of the information I gave you is... false...
Feng Yongrui: Wait, then all this time, I was doing the task for the wrong person?!

...Nth world:

System: Host, it seems like --
Feng Yongrui: ...I'd rather not know what went wrong this time, QAQ
***