The film is set in 2041, in the time when humans live along with machines. Álex (Daniel Brühl), a renowned cybernetic engineer, returns to his hometown of Santa Irene after a ten-year absence on the behest of the Robotic Faculty, led by Julia (Anne Canovas), his old mentor. Julia has commissioned him to finish the SI-9, a robot built to resemble a child -- a project that Álex abandoned prematurely after working on it with Lana (Marta Etura), his old lover, who is now married to David (Alberto Ammann), his brother, both of whom had given up researching to teach.