Transmigrate into a Book: I Refuse to Be an Evil Stepmother

An unremarkable secret agent transmigrates into the body of an unloved second wife. Her husband can't forget his late wife, her stepson hurls insults at her, and the servants kick her while she's down... Her: It's all trivial. Don't bother me while I'm eating chicken. Once I'm full, I'll have the energy to figure out how to pick the storeroom lock! But what's the deal with that former sister-in-law who's so sweet on the surface and sharp underneath? Why does she have the same name as the heroine of the female-led novel she was reading before she died? She can't afford to mess with the heroine's aura. If the female lead wants to steal her convenient husband, then she'll steal the heroine's devoted male supporting character instead. But why isn't this male character anything like the one in the book? Why isn't he as considerate as the book said he'd be? Why does he have a child? And why is he kind of scheming? “Husband, who are you, really?” “We already have a child, and you're only asking now?” He stared at the little woman, his face dark with frustration. One moment she was shrewd, the next muddleheaded; sometimes timid, sometimes fearless. The little woman rubbed her nose and decided to let things be~