I recommend 'The Vicious Female Supporting Character and the Villain' as the plot of this book fits your description. The female supporting role hindered the development of the relationship between the male and female leads. The female lead's family thought that the female lead's sister had an engagement with the male lead. The male protagonist only loved the female protagonist, but the female protagonist fell in love with the male protagonist at first sight. I hope you like this fairy's recommendation. Muah ~π