[Both are faithful to each other + face-slapping + putting scumbags in their place + the hero is determined to win her over + mutual salvation + avenging her mother + the scumbag gets his comeuppance]
(The heroine's revenge for her mother takes up much of the early story.)
In her previous life, Jiang Jinmian was framed by her half-sister, Jiang Shiyu. The Crown Prince, Pei Yunjing, proposed marriage, claiming he had been the one who impersonated someone that day.
Pei Yunjing successfully ascended the throne and ended up with Jiang Shiyu.
He married Jiang Jinmian only to gain her grandfather's support. In the end, her grandfather was killed too.
Jiang Jinmian returns to the day of her wedding, exposes the Crown Prince and her half-sister, breaks off the engagement, and avenges her parents.
Unexpectedly, Prince Pei Yuanzhou becomes obsessed with her, and even the baby in her belly is his.
The heroine runs away for the sake of her unborn child, but Prince Yuan has her brought back by force. He kneels before her in earnest. “Don't go. I'll give you my life if you want it.”
Pei Yuanzhou: “If you break off our engagement, who else would want you?”
Pei Yuanzhou wraps an arm around Jiang Jinmian's waist, looking utterly pleased with himself. “You're everywhere I go. Call me Imperial Uncle.”
Pei Yunjing is completely dumbfounded.