The Lady's Two Identities

Sypnosis/Prologue
She was born to a half-witch mother and an archmage father therefore she was blessed with a lot of mana In her body. When she was 8 years old, her family was killed by an unknown people and she was the only one who survived, she was enraged by her parents' death so she decided to take revenge on them.

"Mom, Dad, Sister. I will avenge your death no matter what." One day while she was practicing magic and swords, she discovered that she had the most powerful magic, however even though she had a lot of mana, she would always get exhausted when using her magical power. And to live without starving she became the youngest assassin, the people of the lavastian empire ordered her to kill all the traitors, and steal 5 gold every week. And one day the duke and the duchess Flowell changed her life from stealing and killing when they decided to adopt her as their daughter because the duchess could not bear a child. After 6 years with her new family, the happy family split up. They died In a carriage accident.
Please read my sypnosis on web novel because the Wattpad makes it short.