Pehredaar Piya Ki is the story of an unusual marriage between a 9 year old boy, Ratan Harshvardhan Singh (played by Afaan Khan) and an 18-year old girl, Diya (played by Tejaswi Wayangankar). Diya sacrifices her own dreams and gets married to Ratan to be his protector and Maan Singh (Parmeet Sethi)) is the father of Ratan in the show.