Manuela dreams of becoming a singer, and in order to pursue that dream she leaves her hometown to move to Rio de Janeiro. After arriving in the city, Manuela falls in love with Arthur, but their relationship begins to face challenges when she discovers that during the day Arthur is one person, and at night he becomes someone completely different. The feelings Manuela develops for Arthur make her believe that she can help him, but how much would she be willing to sacrifice from her music career to stay beside someone she learns to love more every day? With a deeply conflicted personality, Arthur is a young man who lives alone and has withdrawn from his social life because of a condition that changes his personality when the sun rises. At night he is gentle and charming, but during the day he becomes explosive and constantly gets into trouble.