Storyline:

When high school teacher Na Ae Jun shows up for work on an ordinary day, he never expects to bump into his favorite celebrity in the hallway. But when his school becomes a filming location for a show starring Choi Si Yeol, his bias from the idol group A-One, that’s exactly what happens! If that’s not enough to give a fanboy a heart attack, Si Yeol takes an interest in Ae Jun and asks him to join the show as his “co-teacher.”