When a K-Eldest Daughter Possesses a Childcare Novel

Read manhwa When a K-Eldest Daughter Possesses a Childcare Novel / K-장녀가 육아물에 빙의하면
Reborn into a novel she once read, a woman finds herself as the overlooked eldest daughter meant to be a powerful heir, but sidelined for her younger brother. Tired of seeking family approval, she sets out to reclaim everything: power, allies, and even what once belonged to the heroine. But why does that heroine keep showing interest in her…?