Sungmin was transferred to a prestigious school, Sapphire blue academy, in the country, SMTOWN, containing only 10 students, sungmin included, carefully selected by the president. New students will be enrolled only after the current students graduate, and has only two classes in the entire school, class 3A and 3B. sungmin finds out that if class A students becomes friends with class B, a terrible disaster will follow. Will sungmin be able to heed this supernatural rule?