I Promise! 1983 one on netflix

The story is about a factory guy, a young worker Volodya Kalinin, who decided to get a summer job at a pioneer camp as a counselor to «earn some money», and at the same time to relax. But the new case required a lot of effort from him, pedagogical imagination, skill, in short, there was no time for rest. As a result, mutual understanding and true friendship with the guys arose.