A Stepmother's Life After Transmigrating into a Book

This novel is also known as "I Became the Male Lead's Stepmother" and "Those Years I Ran a Kindergarten in the Republic of China." Blurb: Qi Shu, a special life-form from an interstellar world, becomes a small-footed woman from a traditional old-family background in the Republic of China, newly married as the second wife of a powerful warlord. Only after adjusting to her new identity does Qi Shu realize that she has entered a book she personally unearthed from the ruins of ancient Earth. Thinking about all the things she did in the book as a vicious supporting character, Qi Shu goes, "Mm, mm, mm..." She decides she should just quietly raise the children. Children are so adorable, and in the future world, none have been born for hundreds of years. Then, as she raises them, Qi Shu accidentally climbs to the pinnacle of success. An entirely fictional Republic of China setting. None of the male lead's children are his biological children; they are all adopted.