Episode 1 showed fast paced story with all the background details of the cast laid out already. The four main characters have their screen time and somehow they showed their weaknesses or flaws even at this early. It's good because it will be more interesting to watch how the characters will develop as the story continues.
This is a drama where revenge is the main theme.
Jo Min Hyuk [Ji Sung] is a reckless, happy-go-lucky wealthy son but hiding a painful/sad emotion. Seems his girlfriend who is ordinary and doesn't come from a rich family disappeared from his life and he is searching for her. Without her, his life seems a mess and he lives up to his reputation as the son of a wealthy family who only knows how to party. But the fun doesn't make the loneliness go away, so in the end, he can't find happiness for his searchng heart.
I got a feeling that maybe his family is behind the disappearance of Ji Hee, the girlfriend because she doesn't suit him as a future wife or maybe she felt Min Hyuk is not strong enough to fight for her. His family is arranging a marriage of convenience for him with Shin Se Yeon [Lee Da Hee] who looks like she doesn't care much for Min Hyuk but deep inside she feels otherwise. I gather they are long time friends. But maybe this arrangement is to her liking, even though she has yet to admit it.