My Sister the Heroine, and I the Villainess - Chapter 77

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Only a pure maiden can have a privilege to make contract with a spirit.

In Areishia Acadamy, maidens from noble family were gathered there, giving them an elite education to become a spirit contractor. A boy Kamito, by accident he peeped on a girl, Clair, who was taking a bath, and he even made a contract with spirit that she wanted.

Kamito was actually an irregular male spirit contractor, which should not exist.

It has been adapted into comic：CEO’s Sudden Proposal / Flash Marriage Deep Love

She didn't understand why he took her to get married at first sight. She was just friendly to his daughter at the hospital, but she did not expect that his daughter haunted her to be her mother. It's only the first day of their meeting!

She thought he married her only because of his daughter, but in fact, he was deeply attracted by her kindness and simplicity, and he loved her deeply.

For the rest of her life, Will she love him like he love her?

When Ye Qiao received the award for best actress, they asked her about her husband during the interview.
Q: When was the first time that you noticed him?
A: In an old rental apartment. The couple next door was doing special exercises and I happened to overhear it.
Q: When did you officially meet him?
A: I was bitten by his dog and got 6 rabies shots for it.
Q: Why him?

Maybe because she had been lonely and helpless in the past.

She had been hidden herself in the darkness. The only ray of sunlight in her life was from him

A story about Ye Qianxi’s cousin from The Most Majestic You, though the story is mostly unrelated. This story was published before The Most Majestic You and is somewhat more serious

- Description from Novelupdates