😋I recommend the modern romance novel "Cute Fox Loves Her Door: Young Master Di's Strong Solicitude" to you. The female protagonist in the book is a descendant of a nine-tailed fox. Because she failed to transcend the tribulation, she was struck to the wealthy villa of the ruler of the modern empire. She turned into a five-year-old girl and was mistaken for a little beggar who was guarding the door. The male protagonist was the ruler of the empire, handsome and cold, and had no members of the opposite sex around him, but he was called mother by a little girl? The plot is similar to what you described! I hope you like this fairy's recommendation. Muah ~😗