[Mutually faithful couple. The heroine will be a domineering little menace who bullies everyone, and even at the hero's house she'll still be a gloomy, crawling little ghost.]
[Actually, she's an honest woman with no color, scent, or taste, and deadly poisonous.]
Sang Douying was an NPC created for romance, but she transmigrated into a mindless revenge-romance novel as the cannon-fodder ex-wife. Now a thing called the System is telling her to hurry up and win over this person or that.
Sang Douying: I don't understand. I need a husband.
The System sent her a man.
The System: Choose between affection points and regret points. Fill either one to complete the conquest.
The scumbag had every vice under the sun. No other conqueror had managed to win him over, but Sang Douying didn't care. All she needed was a husband, so of course she chose affection points and went all in.
When the scumbag cheated, she climbed onto his mistress's roof to keep an eye on her husband, fell off and broke the scumbag's leg, then dutifully nursed him at his bedside.
When the scumbag refused to come home, she called the protection association and tearfully explained that she only wanted him to come home. From then on, his reputation went straight downhill.
The scumbag was forced to come home and sleep. Sang Douying could watch her husband all night, while the scumbag was too scared to sleep, night after night.
Gradually, Sang Douying became famous for being honest, virtuous, and devoted to her husband. Only the scumbag knew she was a full-blown madwoman. She was driving him insane.
"Husband, you're so disobedient. I have no choice but to keep a closer eye on you myself," Sang Douying said honestly.
Unfortunately, her husband was not the sort to learn his lesson. He still shouted that he wanted a divorce.
That wouldn't do. She couldn't live without a husband.
When the scumbag abandoned her yet again in a deliberate attempt to escape, his boss, Yu Xingzhan, took her home.
So she could get a different husband...?
*
The woman Yu Xingzhan loved became someone else's wife.
Her husband was a serial cheater with a terrible temper.
He decided he had to rescue her.
Mistress x
Hero rescuing the beauty ✓
The strongest Sentinel, a possessive, doting older-man hero x a romance-obsessed, gloomy little ghost heroine
They are both unwell, and they found each other.
She originally planned to fill the affection meter, but filling the regret meter counts as completing the mission too, right?
Theme: Romance-obsessed people belong together.