This is my favorite Korean song of the moment. My kids love that I can sing the English part of the chorus, although I change the lyrics to "I'm so sorry that I love you, but it's time for a grammar quiz" or something to that effect. Sometimes, when it comes to teaching, you have to find ways to amuse yourself in order to survive the day.
Anyway, this song is called Lies or Koh Ji Mal by a group named Big Bang. This video has English subtitles so you can follow it. Enjoy.