Suh Jin Young is an aviation maintenance technician. Her fiance Jae Hoon passed away in a horrible traffic accident. Kim Chae Joon dreams of becoming an aviation maintenance technician but he encounters prejudice because he is an ex-convict. He killed some one with his car. Suh Jin Young gives him a chance to work under her and they fall in love. However that love is severely tested when they both discover that the Chae Joon's victim was Suh Jin Young's fiance Jae Hoon.

Lee Ji Yeon has a natural, affirmative and bright personality and is an accessory designer. Kim Tae Seop is a dectective who is very quiet and is devoted to Ji Yeon after he falls in love with her. Ji Yeon is caught between two men.

Oh Dal Ja is 33 years old and she is an MD of a home shopping channel. She has a "love contract" with Kang Tae Bong, a 27 year old freelancer of a playmate enterprise. The story also revolves around Dal Ja's life with three men. Wee Sun Joo is a divorcee who is an expert on love and faces life with positive thinking.

The Empress (Myung Se Bin) is in her early 30s, but she is still not married. Since, the 1st successor to the throne died, the royal family is in search for a new successor. Incidentally, they come to know of a young man who was in fact a son of the prince to a woman who left the Palace for her to be able to keep her pregnancy a secret. The young man's name was Lee Hoo (Se7en), more commonly known to his friends as Kang Hoo. Lee Hoo worked as a delivery boy at a Chinese restaurant, and was known for his 7-minute maximum delivery time. Lee Hoo had been brought up as more of a punk than a prince so his habits and his way of conversing were very different from the people of royal blood. Although he had never dreamt of living in the Palace, he one day finds himself immersing himself in its grandeur and improving himself to prove that he indeed deserves to be called the Successor to the throne.

He soon finds out that not only will he be facing lessons to the path of royalty, and dilemmas of love and of stature, but he will also learn to compete for the position he had been, first and foremostly, called for.

Lee Jung Do's father is a swindler and intends to resume his old habits as soon as he got out of prison even though he has promised his son to go straight. Because of his father's record, LJD had a hard time finding jobs but he overcomes these obstacles, passes law exams, and becomes a prosecutor. Oh Young Joo is a detective and her precinct is in LJD's neighborhood. Kim Joon Ki who comes from a well off family is also keen to become a prosecutor. He meets OYJ through a blind date and has continued to pursue her even though she isn't interested. Moon Chae Ri is a small time swindler who hooks up with LJD's dad in his plan to do one last job before fulfilling his promise to his son to stay out of trouble.

The Empress (Myung Se Bin) is in her early 30s, but she is still not married. Since, the 1st successor to the throne died, the royal family is in search for a new successor. Incidentally, they come to know of a young man who was in fact a son of the prince to a woman who left the Palace for her to be able to keep her pregnancy a secret. The young man's name was Lee Hoo (Se7en), more commonly known to his friends as Kang Hoo. Lee Hoo worked as a delivery boy at a Chinese restaurant, and was known for his 7-minute maximum delivery time. Lee Hoo had been brought up as more of a punk than a prince so his habits and his way of conversing were very different from the people of royal blood. Although he had never dreamt of living in the Palace, he one day finds himself immersing himself in its grandeur and improving himself to prove that he indeed deserves to be called the Successor to the throne.He soon finds out that not only will he be facing lessons to the path of royalty, and dilemmas of love and of stature, but he will also learn to compete for the position he had been, first and foremostly, called for.

A fate that surpasses taboo, a love that surpasses morality...

Hyun Ji-seok (Kang Ji Hwan) is at the peak of his life at thirty-one year old he is fated to leave this earth in three short months. he is married to Park Jung-ran (Jung Hye Young), but it's not shes not his true love. The one and only thing this man wishes for is to find his one true love and spend the remaining 90 day's that he has left with her.

Hyun Ji-seok was fated to meet Mi-yeon (Kim Ha Neul) but their hearts were destined to be broken in the end. Through an unexpected turn of events, Mi-yeon turns out to be his his first cousin. They are now desperately pleading for 90 days in which to love each other for the last time on earth.

Will their love be able to overcome the harsh realities of society?