Yoon Jae-in (Park Min-young) is a hardworking nurse who does not remember her past. In fact she is the daughter of Yoon Il-goo (Ahn Nae-sang) who was the president of a trading company. Yoon Il-goo was killed in a car accident orchestrated by his friend Seo Jae-myung (Son Chang-min), to make sure that Jae-myung takes over control of the company. When Jae-in's mother Eun-joo (Jang Young-nam) received news of her husband's accident she took Jae-in and drove to the hospital. However, due to heavy rain, they got into a car accident caused by Jae-myung's goons, which separated the mother and daughter. Jae-myung ordered Kim In-bae (Lee Ki-yeol) who works as his chauffeur to send Jae-in, who had lost all of her memories at the time, to an orphanage, where In-bae told her to never forget her name. 17 years later, In-bae's son, Young-kwang (Chun Jung-myung), is a baseball player and one of the league's most promising sluggers, but he's since been demoted to the minors. He had a fallout with his rival, Jae-myung's son, Seo In-woo (Lee Jang-woo), who not only comes from a rich family but is currently the league's top star. While injured, Young-kwang meets Jae-in, and she saves him with a blood transfusion. Under Jae-myung's orders, In-bae is chased and killed in an accident orchestrated by his goons, to prevent In-bae from revealing Jae-myung's dark secrets. Young-kwang decides to quit being a baseball player and owning his father's noodle shop. Jae-in also quits her job as a nurse to find a job with Young-kwang. In-woo finds himself disowned by his father, and the three of them apply for jobs at Jae-myung's office. Young-kwang and In-woo continue to vie for Jae-in's affections in a bitter rivalry that goes far back to their childhoods. Seo In-chul (Park Sung-woong) also enters their lives; his lover is Kim Kyung-joo (Kim Yun-joo), who happens to be Young-kwang's runaway sister. Then Eun-joo awakens from her coma.