A young school teacher Tanya works at a night school for working people. But it's uneasy to get used to grown-up men, their constant attempts at flirting, their sometimes too manly jokes and comments. She is especially irritated by Don Juan-like behavior of Sasha Savchenko. She avoids his advances, and Sasha becomes so upset that he drops out of school. After a while, Tanya gets used to this new for her environment, finds in her heart an attraction to Sasha, and there comes Spring, exams time... This is one of the most lirycal and well-known films of a relatively liberal (after-Stalin) Khrushchev's era.