Cha Moo Hyuk (So Ji Sup) is an orphan that was abused by his adoptive family. So he ran away and learned the way of the streets, meeting all sorts of people. Because of an accident involving is ex-girlfriend, he has 3 months to live. So he goes to Korea filled with anger and hurt about his birth mother.

Then in Korea he meets someone he least expect himself to love. But how can he be able to love, hate, and revenge within the short three months of his life?

Lee Soo-jung (Ha Ji Won) is a travel agent who is seeking her good luck in Bali after a harsh and unforgiving childhood. She meets Jae-min (Jo In Sung), Kang In-wook (So Ji Sup), and Young-joo (Park Ye Jin) in Bali, three seemingly perfect people entangled in a triangle of love. When Lee Soo-jung finds herself back in Seoul, her desire for success leads her to seek Jae-min for a job, unwittingly setting off a course of events that further complicate the love triangle.

What Happened in Bali is a drama that reveals the inner materialistic desires of people. It reflects upon the sometimes ugly (but truthful) side of man where nothing matters more than money.

More than a thousand years ago from the present time, Puyeoju is the Baek Jae Empire's princess. Unlike other princesses, she is active and skilled in the arts and in sports. When the Baek Jae Empire crumbles due to a spy, Kum-hwa, she runs away with her bodyguard General Guishil Ari and falls in love with him in the meanwhile. The new conquerer Kim Yu-suk is also in love with the princess, but only receives hate in return. In a desperate attempt to win her, he kills Ari, but the princess runs away and jumps off a cliff to kill herself. While falling, she travels more than one thousand years into the future, which is our present time of 2003. Only she remains to be who she was, and she encounters Ari to be an aimless fashion designer Kang In-chul with a warm heart and bad temper. Although he is annoyed at her ignorance of the present world, he comes to fall in love with the princess again. Fujiwara Tatsuji is the son of the Fujiwara dynasty, and once again is mysteriously attracted to the princess. Only she knows the past that holds all three of them together, but will things become an exact replica of the situation back then?

This drama is about the lives of Tae-hee and Yun-hee, two sisters whose mother died while giving birth to Yun-hee. Their father, who loves them dearly, married their mother without their paternal grandfather's consent, and deprived of any familial support, the sisters and their father struggle to make ends meet even as their father faces a life-threatening illness. This drama follows Tae-hee and Yun-hee into adulthood as, separated by a cruel twist of fate, the girls come to lead very different lives, oblivious of one another.

Ho-Jung is a cute, naive girl who often falls head over heals with the wrong guys. Both Ho-Jung and Kyu-In, her neighbor, are idealistic about love. They start off on the wrong foot and treats each other as if they were siblings, constantly fighting. Ho-Jung's friend Cha Hee has a thing for Kyu-In and Ho-Jung later realizes that she too has feelings for him. Ho-Jae, Ho-Jung's brother, is a player, who has good physical features. Things start to get complicated for Ho-Jae when he falls for Ho-Jung's friend Soo-Ji, who does not have a physical appeal but has a good personality and intelligence.