Han Woojae put his dream of becoming a screenwriter on hold to take care of his family and support his already successful writer wife, Lee Seojin, until their daughter turns 8. One day, a mysterious girl approaches Woojae, claiming that his wife is doing "bad things" behind his back. She tells Woojae that she is the only person who knows all of Seojin’s deep, dark secrets. As Woojae learns about his wife’s past, he wonders what lengths he must go to protect his family and keep them together.