After 16 years abroad, Tanguy returns home to live with his parents, disrupting their peaceful lives with his presence. His parents must find a way to deal with his intrusive antics.

Tanguy is a 28-year-old man who still lives with his parents. His parents are desperate to get rid of him and try various methods to make him leave. However, Tanguy seems content with his current situation and refuses to move out, causing frustration and humiliation for his parents. As they become increasingly desperate, they resort to psychoanalysis and even consider relocating to China to force Tanguy to leave. This French comedy explores themes of family dynamics, independence, and mother-son relationships.