Half sisters Bae Suzy and Lee Jieun head to the Korean waterpark, Caribbean Bay for a fun day in the sun. The clumsy Jieun meets a boy with incredible nice skin.

Thunder's corrupt company was on the verge of bankcruptcy.  As a last resort, his parents set an arranged meeting for him to attend.  He meets the beautiful IU, and the two fall in love at first sight.  Blinded by Thunder's selfishness and IU's inexperience, the married couple divorced.  Years later, Thunder is living in poverty and he meets IU again... under ugly circumstances.