I really loved Goong. The plot was very Cinderella like, but it wasn't too typical of a romance. The plot was different, and the acting was great. The characters were all three-dimensional, meaning they had a mix of traits and weren't your typical, frail, weak female lead and strong, yet somewhat pms-ey male lead.
There were some parts where the plot got a bit strange, but overall, it was really good, and you ended up sympathizing with the "bad guys" rather than hating them.