High school professor of chemistry and physics Samo Demšar is an excellent teacher and always on the side of the students. He is an eternal youth in personality and still a teenager at heart, which is why he understands his students so easily. But he often finds himself in trouble, also because women like him at least as much as they like him. At first, it seems that the exception will be the new professor at the high school, the attractive Slovene scholar Klavdija Jaklič, who is very happy to participate in Sam's solution to the various problems faced by the growing students. In the first episode, Samo accidentally reveals to student Roku that his parents adopted him.