Comrade engineer works every day at a top-secret scientific institute. He timidly falls in love with a new employee who has just come to work. Love forces a comrade engineer to find the strength to finalize the drawings, get parts in a dangerous yellow radioactive forest and gather colleagues together to complete work on a strange machine of happiness. It would seem, what a sweet story about how a comrade engineer achieved the recognition of colleagues and love, but there is one thing.