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It's about a Korean girl w cancer and transported in a book she was reading. In the book, she's a princess that was born from the queen and she was part of the kids that vie for the throne. Father is neglectful to kids but loves his wifey very much. In the sword choosing ceremony, MC chooses her dad instead of swords. She's also time limited, since she dies at the age of 21, and the main antagonist became her tutor.