Jung Yoo Hee married the love of her life, Yoon Sang Woo. However, his mother despised Yoo Hee and forced Yoo Hee to leave her husband and young daughter. Years later, Yoo Hee returns with the intentions of getting her family back. Will Sang Woo be willing to let her back into his life and what about his new wife, Seo Hyun?
Lee Kang Hyun is a manager at a company that sets up people who have been divorced with dates. She meets a divorce attorney, Park Hyun Soo, and they begin a relationship with each other.
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.
The president's daughter, Yoon Jae-hee (Jun Do-yeon) is a Korean diplomat in Prague. She has only recently recovered from a devastating break up five years earlier with Ji Young-woo (Kim Min-joon), the son of a prominent Korean businessman. Choi Sang-hyun (Kim Joo-hyuk) is a detective who goes to Prague searching for his ex-girlfriend Hye-joo (Yoon Se-ah). Hye-joo broke up with Sang-hyun over the phone from Prague and Sang-hyun can not except it.
Sang-hyun meets Jae-hee in Prague and misunderstandings abound. Eventually the two help each other and become friends. When they return to Korea love blossoms, but their respective ex’s and very different social status put it to the test.