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This one crosses over into historical fantasy as well. Pretty classic trope- MC is - cold-blooded knight, but is betrayed and dies after serving the emperor. When she is reincarnated five years into the past she decides to live a better life. She makes friends, and her enemy from the previous life becomes her love interest. In order to prevent the future from what she saw before, she works with the LI and his allies to overthrow the emperor.