Li Xuan

The eldest daughter of the Yan family, Yan Jinyu, who has been missing for 16 years, has been found. She is brought back from an orphanage by her fiancé, the Second Master of the Yin family.
That year, Miss Yan was 18 years old.
…
The Yin family was one of the top families in the capital.
Second Master Yin's full name is Yin Jiujin. People call him Master Nine. He's 24 years old and has made a killing in the business world.
Master Nine follows his grandmother's wishes and finds the eldest daughter that the Yan family has long given up on searching for. He brings her home to raise her himself.
…
Yan in the eyes of outsiders: "Good figure, good looks, high intelligence"
Yan in the eyes of a friend: "The girl-next-door (That's weird). She's cold and ruthless."
Yan in the eyes of Master Nine: "She's young and inexperienced. She doesn't look like an 18-year-old at all. She looks wild and evokes a sense of pity towards her."
…
Those people who think that the eldest daughter of the Yan family is an unpresentable country girl are all slapped in the face.
Master Nine imagines that the person he brought back is a silly little girl. Gradually, he realizes that the little girl is sometimes quite cool and very strong.
Everyone believes that she has no backing and is just a lonely little pitiful girl. Unbeknownst to them, she has a few companions who have gone through life and death with her countless times. Together, they've built an amazing venture.

Henyee Translations

The Atypical Young Lady Has Returned

Henyee

In the end, under Yan Jinyu's pestering, Yin Jiujin helplessly went to the study to find a photo without even washing his face first.

Yan Jinyu followed him to the study room. She kept tugging at the sleeping robe at the back of his waist, as if she was afraid that he would run away.

"Did you find it? Did you find it?"

Yin Jiujin reached out and took out a small wooden box from the top of the bookshelf. He turned around and flicked her forehead. "What's the hurry? It's not like I'll owe you anything."

Yin Jiujin didn't flick too hard, but Yan Jinyu still glared at him accusingly. She raised her hand and rubbed her forehead. "Brother Nine, if you treat me like this again, I'll retaliate!"

Yin Jiujin raised his eyebrows and quickly lowered his head to kiss her forehead. "It won't hurt after a kiss."

"…" Yan Jinyu snatched the wooden box from his hand and couldn't be bothered with him.

The So-Called Fate