At a banquet, songwriter Hannah (Juno Temple) met a producer named Theo (Simon Pegg). Theo's humorous conversation quickly attracted Hannah's attention, and the two decided to work together to come up with something new. But soon, Hannah discovered that sometimes Theo would behave as if he was a completely different person. In the end, Hannah understood that Theo suffered from schizophrenia and was controlled by drugs on weekdays. Once the drugs were stopped, Theo would become another "devil version" of himself. The torture of mental illness made Theo feel extremely painful, and even had the idea of living in seclusion. During the days when Theo was ill, Hannah never left him, encouraging and taking care of this desperate man. Not only that, Hannah also had to take care of her own composing career.