Available as both manhwa and novel.
The Mischievous Baby Is Throwing A Tantrum [Novel] Il piccolo monello sta combinando guai
Also known as: The Bratty Lady Throws a Tantrum · Bé con côn đồ muốn được chơi · Der kleine Lausbub sorgt für Ärger · Il piccolo monello sta combinando guai · La pequeña traviesa está causando problemas · Le petit garnement fait des bêtises · Le petit garnement sème le chaos · O pequeno travesso está aprontando · Si kecil nakal sedang membuat masalah · The Bratty Young Master Raises Hell · The Little Brat Runs Wild · The Little Rascal Is Raising Chaos · The Little Tyrant Is Causing Chaos · The Mischievous Baby Is Throwing a Tantrum · The Mischievous Little Princess Is Throwing a Tantrum · 망나니 아기님이 깽판치신다
Duke Heros Archeon slays the black dragon Sellus, thus freeing the world from calamity—or so he thinks. But then, Sellus transmigrates into the body of Daphne Archeon, the duke’s cruel, petulant daughter, and somehow... this improves the girl’s personality?! Sellus takes over Daphne’s life and vows to train her body until she’s strong enough to kill her father. However, when dark mages threaten her family and kingdom, a feeling of righteous responsibility flares in her bratty little heart.