(This isn't written in first person. I don't know why the recommendation tag says first person. The first chapter is, but not the second.)
Su Ning is the real daughter in a melodramatic novel, but also its most expendable character.
She saves the heroine, so the hero forcibly takes one of her kidneys, and she develops ALS, with only days left to live.
In the end, the heroine dies. Yes, this is a pure tragedy.
Su Ning, who guesses the plot at the beginning: An expendable character, a kidney transplant? Let's see if he can actually take it.
A sudden mission midway through: Stop the hero from turning evil.
Su Ning scowls: Huh? Can I just kill him already?
After the hero turns evil, the System gives her a mission: Stop the apocalypse.
Su Ning: People are already eating each other! How am I supposed to stop this?
After the apocalypse, Su Ning confirms her relationship with Lu Zhe. Then she watches aliens descend from the sky in a lavish, futuristic spaceship.
Su Ning: Are you sure the place I live is a fictional world?
By the very end, Su Ning is completely numb. Besides gaining a sweet romance and a cunning yet shy boyfriend,
she has also witnessed wonders that could never happen in the real world. Without the System, she probably would have gone completely insane!
I have read them all, please update. I will continue to follow up on updates, great.