Imprisoned for Three Years, I Flee Pregnant and Drive the Tyrant Mad

Palace intrigue + physical and emotional torment + the groveling ex chasing his wife + running away while pregnant + rabid-dog male lead and yandere second male lead

Not a revenge power fantasy. The heroine is miserable throughout, and only starts viciously tormenting the male lead after she goes mad at the end. She really does go mad.

Not a pure romance. The heroine is abused, and both male leads are trash.

The day Empress Chu died, a heavy snow fell.

From then on, Pei Lin despised snowy days,

thinking they brought bad luck.

He and Lian'er had been childhood sweethearts, but political circumstances forced him to make Chu Yue his empress.

On their wedding night, he had meant to turn and leave, but beneath the candlelight he caught sight of her slender wrist and her delicate waist, narrow enough to fit in one hand.

As if possessed, he took her. From then on, he grew ever more addicted to her body.

Whenever he summoned Chu Yue to his bed, guilt toward Lian'er welled up inside him. So he turned their nights together into torture: it satisfied him without sullying the bond he shared with Lian'er.

He loved Lian'er and used Chu Yue to satisfy his lust. It all seemed to work out perfectly.

Until that snowy night, when word came from the Cold Palace that the former empress had died.

…

The heroine's perspective: Young and naive, she gave her heart to the wrong man. She never fought or made demands, and all she received in return was a lifetime of humiliation.

Reborn, she still cannot escape the tyrant's grasp. Just when she thinks everything is finally looking up, she realizes she has only escaped one prison to fall into another.

…