In 1986, Merlo made his cinematic debut with Hay que deshacer la casa, [2 ] in which he played a young boy who sexually molested an old woman, a role played by his aunt, Amparo Rivelles.
Luis Merlo is known as an Actor. Some of his work includes Internát Černá laguna, La que se avecina, No One Could Live Here, Pohádky z lesa 2, Babysitters, Alone, at Last!, Hay que deshacer la casa, and La senyora.