Everyone knew about the promise. Years ago, two of India's most influential families decided that their children would one day be united in marriage. From that moment, everyone believed the elder daughter, Aadhya Rathore, was destined to become Aryaveer Singh Rajawat's wife. Everyone... Except the two people whose hearts had already made a different promise. Aryaveer never loved the girl chosen for him. He loved her younger sister. The quiet one. The forgotten one. The girl who smiled through every comparison, every rejection, and every heartbreak. Unable to let her go, Aryaveer and Aarohi secretly got married, hiding their relationship from the entire world. Now, their families are preparing for Aryaveer's engagement... to Aadhya. Only five people know the truth. One hidden mangalsutra. One secret marriage. One promise everyone believes in. And one love that refuses to stay hidden forever. Sometimes, the greatest betrayal isn't breaking a promise... It's believing the promise was ever yours.