The System Teaches Me to Become a Ghost Cultivator, but I Just Want to Be Reborn!

[No romance + nearly invincible protagonist + System] Jiang Wuyan is a ghost, one with enough resentment to remain in the world, but no idea what to do with herself. This empty-headed ghost drifts and drifts until she meets a System. The System says it can make her incredibly powerful, and that once she’s strong enough, she’ll be able to discover why she can’t be reincarnated. So the silly ghost Jiang Wuyan devotes herself to the path of ghost cultivation, never turning back, all for the chance to be reincarnated. The System says accumulating merit helps with cultivation. Fine. Helping others is a virtue, so she starts haunting crime scenes and every corner of the world. If it earns merit, Jiang Wuyan will do it! Then a cat suddenly appears and tells her she isn’t a ghost, that she bears an enormous burden, and that she must overcome all kinds of tribulations to save the human world. Good heavens, what is all this supposed to mean?! [There are lots of original ideas here, so please read carefully. The author is socially anxious and doesn’t reply much, but will definitely make corrections if anything is wrong.]