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Only after Empress Lizzie died did Emperor Leon realize his foolishness and regret it late, but the ...
The ML emperor gets isaekai-ed. After his wife (that he doesn't care about, or bothers to save) is poisoned to death he reads her diary and realizes she was horrible abused by her parents and him. He goes back in time to when they are children to save her from the abuse and give her the happy life she deserves, but not without some twists and turns.