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Help me find a transmigration manhwa where the FL is reincarnated as a dukes daughter but she's a mercenary and comes to know about her previous life. She has a sister who is the original female lead whom she wished to protect and due to circumstances ahe has to go back to ducal home and Duke says you're the dukes daughter don't bow your head to anyone.
I remember the FL has dark hair and scars on her body due to her being a mercenary