After a gym is built directly on top of Zeki's (Elyas M'Barek)'s hidden stash of stolen cash at Goethe School, the ex-conman decides he has no choice but to apply for a role at the school. However, instead of getting the job as janitor he thought he had applied for, he ends up as a substitute teacher. Underqualified and inexperienced, he proves himself to be the craziest teacher of all time. By day, he works to bring the unruly class 10B back on track. By night, he secretly digs for his much-needed loot. Although the prim and proper fellow teacher Lisi (Karoline Herfurth) condemns his unorthodox, draconian approaches in the classroom, she finds herself falling in love with him and ends up helping him dig up something more valuable than cash?