Young theoretical physicist Konstantin researches quantum effects and teaches in the university. In summer, he goes to the sea with his students. Every day our main character has lessons for a group of students late with their assignments, and every evening he is on duty, which means he is always in the way of students having fun. Perceiving reality through the lens of Physics, Kostya sets classical world in opposition to quantum world, or rather average people world to perfect, subtle, and complicated.