Warm medicine emits fragrance

A cheerful and easygoing young nanny vs. a short-tempered and easily angered nobleman
Sweet romance novel, both leads are virgins, set in an alternate universe, featuring a bickering couple.
One does whatever they want, the other is angry every day.
Li Chenbi was born with a fever that requires lifelong medication to suppress.
The medicine is potent and needs to be supplemented with warming substances.
Milk is warm in nature, which is most suitable.
Fan Liuer was born with a constitution different from ordinary people, and she was married as if she were not. This was a secret that could not be told to others.
After her parents passed away, her sister-in-law disliked her and arranged for her to marry someone else.
Who would have thought that she would encounter a flood on her way to her husband's wedding, and that her husband, whom she had never met, would perish and go missing.
Penniless, she had to find work to support herself, and just then, the Li family was hiring.
The work at the Li family's residence is too good. The pay is high, the work is easy, the food is good, and the masters above are nice. Fan Liu'er thought she wanted to work here for the rest of her life.
Unexpectedly, one night, she was put into her master's carriage and saw another side of him.
Fan Liuer: You ask what kind of person my master is? He's sick. He's not only physically sick, but also mentally sick!
Li Chenbi: Fan Liuer? She's a heartless, ungrateful wretch! Whoever marries her will be doomed for life!
Who wants to marry her?
You want to marry me?
Heh heh, prepare to die!