Sweetheart, You've Lost Your Secret Identity

She's just a country girl, rough-looking and dim-witted. Her mother brings her back to the city solely to have her take the place of the real heiress and marry a dying man.

Who knew that every random contact in the little country girl's phone would become a world-class big shot seven years later? She takes just one exam and gets accepted into a top-tier university! She agrees to a single stand-in marriage and finds herself with a mysterious big shot who spoils her rotten!