Carrying a Space Dimension to Ancient Times Starting off by Taking Down Cruel Parents

Qin Nian returned home from a business trip and saw a pair of high heels at the door — they weren’t hers.
She pushed open the bedroom door and saw a man and a woman “entangled” together, doing something that could only be understood, not explained.
The man was her fiancé.
Qin Nian rushed over and tore at her fiancé, but at the same time, her congenital heart disease flared up — she died of shock.
When she opened her eyes again, she saw the same man and woman “entangled” together, doing that same indescribable thing.
Emma, what’s going on?
Soon, Qin Nian understood what was happening — she had transmigrated and been reborn into ancient times.
It was still a barren year, with food shortages and scant clothing. Besides her grandmother, who was as thin as a fishbone, there was nothing else at home.
But how could this possibly defeat her?