Sebastian Sterling, heir to Sterling Global, has raised his twin sons alone for five years, their mother's identity a secret. Evelyn Cloud, the unloved adoptive daughter of the Cloud family, lives a lonely life until a chance encounter changes everything. One twin instantly clings to her, calling her "Mommy". Soon, his brother and their formidable father, Sebastian, draw her into their world. As bonds form with this intense trio, the shocking truth behind the twins' origins begins to emerge.