Reincarnated as a side character, the protagonist decides to leave her old life behind and become the favorite of the world’s richest and most powerful villainess. To her surprise, the villainess is much cuter than the rumors suggested. Despite cold remarks, the villainess offers the protagonist a chance to marry her brother. However, this brother, who was devoted to the original female lead, seems to be showing unexpected interest in her, leaving the protagonist confused about his sudden attention.