After I Transmigrated into a Book, I Became the Big Villain's Master?

[A possessive, obsessive puppy-like boy] X [A gorgeous, ethereal beauty] She transmigrates into her own novel as a master and raises the villain, hoping to bring up a beautiful, well-behaved child who will care for her in her old age and see her off at the end of her life. But why does the child look at her so strangely? Later, she dies saving him. He goes mad and conquers the world, making it her funeral offering. In the blink of an eye, she is reborn and adopted by the city lord's wife. From then on, her life takes off, but she never forgets the one in her heart who unified the Three Realms!! Then one day, at a banquet, she finally meets the one she has longed for day and night!!!