Lucero’s life appears immaculate: a wealthy household, a devoted husband, and two children who embody the promise of a perfect family. Yet beneath this surface simmers a quiet dissatisfaction. When Matías, a young swimming coach hired by her husband, enters their lives, Lucero finds herself pulled into a risky and consuming relationship. As secrecy, desire, and jealousy tighten their grip, the boundaries within the family begin to collapse, placing mother and daughter in a dangerous emotional triangle that threatens to shatter everything Lucero has built.