Laura call him "Uncle Martin." Although no one else knows, he is "DW", the writer of the blog about "The mysteries of Laura", a tangible proof of his affection and admiration for Laura and perhaps something more. He is somewhat promiscuous and flirts with almost all women, something that brings him some problems. Vicente Cuevas (César Camino) is a rookie police officer with a lot of nerves and insecurity. The agent Cuevas took over four years to pass the exams to be into the Police Force. His youth, lack of character and lack of experience make him an easy target for criminals who is supposed to stop. His lack of nerve as a field agent is compensated with a great effort to learn and to always follow the orders of his superiors. He is also very good at working with computers, work performed at the police station. His affable and cheerful personality makes him a dear friend of Laura. He wins the heart of Lydia and even asks her to marry him. Lydia Martínez Fernández (Laura Pamplona) is a police detective working at the station. Her way of working hardly fits with Laura, Lydia's working method is systematic, analytical and scientific. She works in the police laboratory. Lydia doesn't consider Laura as a real police detective and clashes with her are obvious. Her relationships with other co-workers is not much better. She has a past life: she changed her name to not be found by her husband. She had a past relationship with Jacobo. Later, Cuevas managed to break the hard shell covering her heart. Maribel del Bosque (Beatriz Carvajal) is Laura's mother. After passing through a bad time, Maribel decides to move with her daughter. She loves her grandchildren, but due to their restless nature she did not hold them for long. Instead of removing work from Laura, she seems to give her more. She doesn't like the profession of her daughter, but unwittingly and thoughtlessly she always gives her clues for her police cases when they are discussing them off the record. She has the same casual and pleasant personality of her daughter. Javier Salgado Lebrel (Raúl del Pozo) is son of Laura and Jacobo, twin brother of Carlos. He's very naughty and makes thousands of pranks with Carlos, even at school. Carlos Sagrado Lebrel (Juan del Pozo) is son of Laura and Jacobo, twin brother of Javier.