Ha Tae-hee, a 4th year student in education department at Hankook University, is in trouble recently.Choi Jaeyeon, his junior... he's too annoying!Jaeyeon sticks to him and follows him everywhere in school. Now he's following Taehee, saying he'll help play the role of a student for his teaching practice classes...Will Taehee be able to finish his teaching practice classes safely?