Ex-con Zeki Müller goes undercover as a teacher at a below average Gymnasium to find money he'd stashed prior to incarceration.

Dissatisfied with his new work at the Goethe-Gesamtschule, Mr. Müller is tired of early mornings and correcting exams. Meanwhile, director Gerster strives to be a symbol of the new company. To do so, her attempts to improve the school's image involve revoking the partnership from the Schillergymnasium with a Thai school. In a last-ditch saving grace, Mr. Müller, Mrs. Schnabelstedt, and the 10b must take a trip to Thailand.

Bank robber turned teacher Zeki Müller tries to get his class of misfits through the A-Levels but the usual escalations plus lack of future perspectives make it quite difficult.