| Character | Actor | Description | |-----------|-------|-------------| | Marcos Noval | Martiño Rivas | Protagonist; brave, impulsive, searching for his missing parents. | | Carolina “Carol” Leiva | Ana de Armas | Marcos’s love interest; strong-willed and resourceful. | | Iván Noiret | Yon González | Troubled student, son of the school’s gardener; later a hero. | | Paula Noval | Carlota García | Marcos’s younger sister (age 8–10); kind and intuitive. | | Elsa Fernández Campos | Blanca Suárez | Ambitious, intelligent student; daughter of a fascist family. | | Julia Medina | Amparo Baró | The headmistress; kind but hides a terrible secret. | | Héctor de la Vega | Luis Merlo | History teacher; ex-priest; helps the students. | | Jacinta García | Marta Torné | Young nurse; later revealed as a key ally. | | Dr. Ricardo Meier / Dr. Stein | Iván Hermés | The Nazi doctor; primary antagonist (flashbacks/ghost). | | Fernando “Fer” | Elena Furiase | Sweet, sensitive student; friend to Marcos. | | Camilo Belmonte | Daniel Retuerta | Antagonist student; bully, later redeemed. |