Harmony is every good guy’s nightmare. She’s sarcastic, loud, and indecisive, with sharp edges and imperfections, while her older sister Melody has always been perfectly well-rounded. Melody’s simple, while her sister Harmony is complicated. When Melody insists her boyfriend that Harmony should stay with them for a couple months, he declines immediately. But as he soon realizes that family is extremely important to Melody, he allows Harmony into his home. To Melody’s dismay, Melody’s boyfriend holds a grudge against her sister, but never speaks up about it. As Harmony arrives, tension arises, exposing critical secrets that even Melody never knew about.