Theory: some French guy saw Shakespeare in Love, and said "Hey, we can do that too." Or whatever that is in French.
It's the story, told almost entirely in flashback, of young Molière; the struggling actor/playwright is rescued from debtor's prison by a Monsieur Jourdain, a social climber who wants his help in seducing a young witty beauty. Jourdain is rich, but he's also married; this requires Molière to assume a false identity in the household in order to disguise his true mission. But soon enough he's involved with Jourdain's wife… It's all very French, and if it reminds you of some play you dimly remember from a past literature class, that's intentional.
It's quite funny in spots, not above slapstick and sight gags. And there's a neat plot twist, as Monsieur Jourdain transforms himself from a cuckolded buffoon.