A story of 13 boys who are studying on SVT High School. It's an all boys school located in the heart of Seoul South Korea where some of them were put together into one class. They called it "Class of 17". It's been separated from the regular class building. Their classroom is somewhere near the gym and it's the last and 17th classroom of SVT High School. As the 13 of them living the complicated life of a student, they will learn not only the lessons that they need to study but also the lessons of love. WARNING: (BL) Boy X Boy Love Story featuring the boys of SEVENTEEN (K-POP Group)