Watch 123Movies. Sandra is now over 40 and lives with her husband, Héctor, a bus driver who doesn't let her work. Sunk in the routine of household chores, one day she meets Darío, a teenager who works as a laborer at a local grocery store and is trying to finish high school. With exams approaching, Sandra selflessly offers to help him with math, unaware that she will gradually begin to feel attracted to her young student.