A would-be singer has been preparing for her career for 3 years. The day before her debut she hears some shocking news which throws her into despair.

An unemployed loafer who meets her by chance and the two fall in love.

A representative of an entertainment company meddles in these two lovers' relationship.

Kim Bum Sang is a arts scholar who is crazy about virgins and is a supervisor of property assets. Heo Cho Hwi is a 29 year old woman who is always mistaken as someone who is crafty because of her natural-born sexiness. The story will be about how these two cross paths and how their chance meeting will cause turmoil for the both of them.

Ban Ha Jin (Lee Dong Gun), an orphan and high school drop out, is calculating and ambitious. Even though he dropped out of high school and lives with Choi Yoo Kang (Yoon Se Ah) due to extenuating circumstances, he used to be the high school president and hoped to go to college. Through coincidence, he meets Yoon Jae Myung (Lee Jin Wook), the popular former baseball player from high school, at a bar in Switzerland. Ha Jin manipulates a series of events to become Jae Myung's best friend. Also coincidentally, he meets Oh Dan Hui (Kim Hee Sun), the girl he loved and hurt in high school. Oh Dan Hui used to play baseball on the boy's team but now plays softball in college. Her baseball hero is Yoon Jae Myung. All three meet again in Switzerland and again back in Korea. Ha Jin starts working in Jae Myung's father's company and does everything to make the rich chairman like him. Jae Myung starts working as the softball coach of his father's company's team but then gets transferred. He falls in love with Dan Hui who's headstrong and optimistic personality attracts him. He asks Ha Jin for advice, but Ha Jin cannot bear to watch Jae Myung take his true love.

Ji Young Sun Han Hye Sook, when she was very young, gave away her daughter Lee Ja Kyung Yoon Jung Hee after giving birth. She later remarries and creates a new family, but soon after, her husband dies leaving her behind with her stepson Gu Wang Mo Lee Tae Gon and daughter Gu Seul Ah Lee Soo Kyung. Now grown, orphaned once again by the passing of her foster parents as a child, Ja Kyung lives a life of loneliness and lack of love. Her birth mother Young Sun, comes to find her, but in order to keep her daughter Ja Kyung by her side, she tries to match up her stepson with Ja Kyung.

During their childhood, Dong-ju and Gi-tae are both abandoned by their real parents. In the orphanage, they grow up like brothers and become best friends. Ji-su transfers to the school, where Dong-ju and Gi-tae attended there. But at the same time, they both fall in love with her. While trying to get the ocarina, Dong-ju is caught in the river and is presumed drowned. A Japanese couple adopted him after he was being drowned in the river, Dong Ju became a heir to the corpotate throne. Gi-tae takes Dong-ju's place in Ji-su's affections and later become a couple. Twelve years later, Dong-ju returns to Korea as a Japanese gentleman, but his feelings for Ji-su begin to develop and his friendship with Gi-tae begin to unravel.

This romantic drama is set in the romantic city of Paris, France. A weird twist of fate connects three people from completely different worlds to one place where they begin to develop feelings towards each other. At first none of them realize what they are getting themselves into, but as they get to know each other more and more their feelings toward each other begin to deepen...

This drama begins when Tae Young decides to go to Paris to work on writing a scenario that would truly capture the essence of this romanic and beautiful city of Paris. There she meets Gi Ju while working at a friend's stall and Soo Hyuk when her bicycle breaks down. Gi Ju asks her to act as his fiance so he could get the interest of a client he was meeting in Paris. While at a party hosted by this client something goes wrong to reveal the truth about their relationship. There they decide to call the whole thing quits and break up. They both go to Korea where fate pulls them back together.

Tae Young, Gi Ju and Soo Hyuk begin to develop friendships with Tae Young and end up feeling more feelings towards her than they initially thought. The thing about both of them having feelings towards one girl was that Gi Ju is Soo Hyuk's uncle and they had grown up like best friends since they were only about 7 years apart. Their feelings towards her slowly begin to be revealed causing heartache for all the people around them.

The concept of an arranged marriage is often difficult to accept, especially amongst less traditional adolescents today. Sweet 18 (Nang Rang 18 Seh) covers this very premise and the story begins when Kwon Hyuk-joon's grandfather, the head of the traditional Kwon family agrees to an arranged marriage between his grandson (Lee Dong Gun) and Yoon Jung-sook (Han Ji Hye) when Yoon Jung-sook is born. 18 years later, the two families lose contact because soon after the contract is signed, Jung-sook's family encounters financial issues and is forced to run away.

Meanwhile, Jung-sook has grown up to be a rebellious and strong-willed girl who just wants to live her life as she sees fit. With little aspirations, she is the direct foil of her achievement-bound counterpart, Hyuk-joon. When the two meet each other, they clash horribly; Jung-sook thinks her fiancee is nothing but boring, and Hyuk-joon believes Jung-sook to be nothing but an immature child. The rest of the series follows their life living together as a couple, and the obstacles they are faced with. When Hyuk-joon's first love reappears and wants to claim Hyuk-joon for herself (despite the fact that he's married), who will Hyuk-joon choose? His first love Ga-young, or immature spunky Jung-sook?