I really love overall message to story and all the characters and relationships thru out drama never get boring.Great casting and acting.This OST with Eric is probably one of my favorites.Love his music.The plot is well written.The transitions from being an emotional turning point to then throw you into such an upbeat poppy song (that is surely to get stuck in your head)nicely done though,To always remind you of the lead relationships story timeline and also to refresh you so it doesn't leave it stagnant .It keeps the story and plot moving well without putting your emotions on to much on a rollercoaster.