Yoon Dowoon:
Senior (moved up a grade)
18 years old
Kim Wonpil:
Senior (started school early)
18
Kang Younghyun:
Senior
19
Park Sungjin
Senior
19
Park Jaehyun
Senior
19, almost 20 (started school late)
(Edit)
Im JunHyeok UwU
Senior (he doesn't go to the same school as the other boys)
19
Some of the chapters will have -SM- and -M-
•SM: slightly mature content
•M: mature