Lee Jeong Mi  hates Jungkook with every fiber within her, but her mom adores him. When Jungkook joins into a mysterious community service, she's forced into following his footsteps; which may have not been the best decision, since badminton club would have been much better than fighting spirits...

After bumping into a music teacher at her adopted daughter's elementary school, Eun Jung, a female resident originally from America, begins experiencing lots of interference in her already hectic life. Suga, from famous boyband BTS, disguises himself as a music teacher during his break, and fails his student, Ji Won -- a mistake that leads to his life changing forever. Added with a wacky PTA system, things are about to get really crazy for Seoul International School.