A girl (black hair) is reincarnated and becomes the empress instead of her sister. The emperor however pays her no attention and has a lover (red hair). I forgot what it was called
I found it! It's "lady to queen" https://www.mangago.me/read-manga/lady_to_queen/
A girl (black hair) is reincarnated and becomes the empress instead of her sister. The emperor however pays her no attention and has a lover (red hair). I forgot what it was called