The Scumbag Tricked Me Out of My College Admission in the '80s Now I'm Slaying with Future Sight!

Synopsis:
Where can you find a husband like Cheng Ping’an’s?
After being sent to the countryside for three years, her life feels like she’s fallen straight into a jar of honey — a loving mother-in-law, a doting husband, and even a sweet, straightforward sister-in-law.
So what if she gave up her university placement? For her husband, she’s willing to do anything.
After all, she was born infertile — she already feels she owes him.
But then… a letter arrives.
It’s signed by herself — forty years in the future.
“Don’t give up your college admission…”