Beneath the Perfect Smile follows Lila Reynold, a high school girl hiding deep pain behind her calm exterior. At home, she suffers physical abuse from her cold, controlling father and emotional abuse from her boyfriend, Ethan. Despite this, she tries to keep it together at school, where she feels isolated and misunderstood. Ryan Stone, her classmate, begins to notice subtle signs that something's wrong with Lila, though he doesn't fully understand yet. As their paths cross more, Ryan's perspective reveals cracks beneath Lila's perfect smile and the dark secrets she's desperate to hide.