Lee Jae Jin's sister, Lee Chae Won plays the make-up artist for Oh Seung Ah (Kim Ha Neul) in "On Air" and appears practically in every episode. Lee Chae Won had debuted initally using her real name Lee Jae Gyung but changed it recently. She did not rely on the fame of her brother's name nor F.T Island to get any favours. That's why not much people paid notice to her.
Unnie Hwating !! ^o^