About a shy history professor and his difficulties in finding a partner through personal ads. Although women are interested in Professor Hrstka, he has not yet managed to get married. His former classmate Koníček, who happens to meet him as a house painter, wants to help him. However, the shy professor prefers to put Koníček forward when it comes to dating. This means that they swap professions, and his new girlfriend asks him to paint her apartment. Koníček has to help him with this.