We'll Live Till Monday(1968)

Original title: Доживем до понедельника

A respected history teacher, Ilya Semenovich Melnikov, decides to quit his job due to distressing rumors about a colleague who is in love with him. His final week is disrupted when a student's controversial essay on happiness sparks a classroom conflict. Melnikov's intervention in the situation ultimately causes him to reconsider his decision to resign.