Nowadays, what would society look like without second degree, without humor? And what would happen in this austere society if a man began laughing? Life follows its course. Children are born, people die and there are things between both. But this society has a little something particular, it does not know laughter. Nobody has ever laughed!
Until the day when a doctor in neuropsychiatry is immediately requisitioned by the army to sound a patient endowed with a strange peculiarity: he laughs and even has a sense of humor. His facial distortions and his inconsistent comments frighten the highest authorities. The man is quickly locked into a bunker with the doctor who has to cure after him so that the plague does not spread in the population. Only this contagion operates and although the sick person is forced into confinement, the doctor leaves with the virus into nature.