A Woman in a Man's Body: From Sweet Girl to Rugged Man, Falling for My Sister-in-Law

A Woman Reincarnates as a Man and Just Wants to Spoil Someone She Cares About, but Ends Up Spoiling Him Right Into Her Arms

Looking for stories where a woman transmigrates into a book as a man, preferably into a story where the original second female lead has a miserable fate. The protagonist feels for her and devotes himself to caring for her, and they end up together. Please, no cutesy, clingy husband persona or wife who acts coquettishly. Good, natural writing, too. (Feng Xiaoqiao and Zhou Yu; please delete if this violates copyright.)