The Real Heiress Wins Them Over with Her Sword

The Minister's residence has found its real daughter, who was switched at birth many years ago. They say she grew up in the countryside and is uncouth. Though the Minister and his wife feel they owe their biological daughter, they favor the fake daughter, who grew up by their side and is refined and well-mannered. Her brothers also comfort the fake daughter, saying that country girl can never take your place. But when the real daughter finally returns, she is not what anyone expected. The fake daughter was once engaged to a prince, but the prince is notorious for his brutality and has now fallen out of favor with the emperor. Another noble has taken an interest in the fake daughter, so the Minister and his wife want the real daughter to marry the prince in her place. They tell her that the fake daughter loves someone else, but the prince is intent on taking her by force and making her submit. The real daughter listens and nods. "I understand." The Minister and his wife are delighted, thinking that a country girl really is so short-sighted. Just hearing she can marry a prince makes her forget everything else. Then they watch as the real daughter draws a flexible sword from her waist. "I understand. You want me to assassinate the prince." "..." Everyone scrambles to stop her. Wait, you understand? What exactly do you understand?! A story about a group of people devising the perfect setup to trick the real daughter, only for her to flip the whole table. Theme: I draw my sword against injustice.