Can you recommend a romance novel from ancient times where the female protagonist calls the male protagonist " Fourth Brother "?

I recommend " The State Preceptor's Little Ancestor Is the Real Big Boss " to you. This book is an ancient romance novel. The female lead played the role of an ignorant and incompetent young lady. Because she had the wrong identity, she was driven to a poor and bitter life. She was doted on by her brothers, including a male lead called " Fourth Brother." His relationship with the female lead slowly warmed up. In this novel, the female protagonist liked to call the male protagonist " Fourth Brother." I hope you like my recommendation.