MTL: Transmigrated as the Male Lead's Young Stepmother [60s]

Story Not mine.
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MTL
Cover not mine

https://www.xbanxia.com/books/272645.html
Lu Nong wakes up to find that she not only got married but also has a sixteen-year-old stepson and a two-year-old biological son. Her husband is thirty-six, holds a high-ranking position, and is fourteen years older than her. As if that's not enough, she realizes she has transmigrated into a "decade novel" as the sickly, short-lived young stepmother of the male lead, who is merely a background character in the story.

Lu Nong: "There's no way I'm going to die early. Let me focus on staying alive first."
She busies herself with making nourishing soups-turtle soup, longan and lotus seed chicken soup, tremella lotus seed and goji soup, and reishi black chicken soup. Unexpectedly, the more she nourishes herself, the more the male lead and his father start looking at her differently.
Male Lead: "Looks like my dad's not up to it."
Male Lead's Father: "...???"

Notes:

Alternate universe set in the 60s, don't nitpick historical details.
Not your typical decade novel-features an older man and a younger wife.
Both the male and female leads are not virgins, and neither was the female lead in her previous life.
The female lead is twenty-two, and the male lead is thirty-six. If there's any inconsistency in ages, kindly help point it out.