How did I not know about this?? Did you? Park Shin Hye’s drama is called Hayate the Combat Butler, and stars Park Shin Hye and George Hu [Momo’s best friend from ToGetHer] as a wealthy heiress and her kidnapping saviour turned butler. She pays off his parent’s debt, and grateful for her help, he vows to protect her from any and all harm.
Check it out here: http://sugoideas.com/drama-2011/hayate-the-combat-butler/
Unfortunately no english subs, but if enough of you are interested, I might recap it.