Could One Imagine? (1980)

Original title: Вам и не снилось

Two high school kids meet in class and fall madly in love with each other. Unfortunately, His father and her mother had a history of their own between them which creates uneasiness in both of them. Also because of that, the boy's mother is very jealous and tries to separate them. The only person that tries to help them is their teacher who has relationship problems of her own.