Chengjun (Kwon Sang-woo) is the son of the chairman of a large Korean company. He has loved music since he was a child and is known as a piano music prodigy. Chengjun's mother is a good friend of the famous professor Professor Han, and the two families often visit each other. Therefore, Chengjun and Professor Han's only daughter Jingshu (Choi Ji-woo) grew up together as childhood sweethearts, and the two have long buried a deep affection. Professor Han's wife died early. After Jingshu grew up, he married the female star Meiluo. Meiluo brought a pair of children born to her ex-husband, Taihua (Shin Hyun-jun) and Youli (Kim Tae-hee), and Jingshu's happy life ended. The vicious Meiluo and Youli made things difficult for Jingshu and conspired to snatch Chengjun away from Jingshu. They first tried every means to destroy Chengjun and Jingshu's plan to go to the United States together. Then, in order to prevent Chengjun from seeing Jingshu after returning home, Youli actually hit Jingshu with a car! After that, they created the illusion that Jingshu had died, and under Meiluo's scheme, Youli successfully became Chengjun's fiancee. After the car accident, Jingshu lost all her memories. The kind-hearted Taihua took her back to her biological father's home. One day, Chengjun accidentally met Jingshu again. Although Jingshu knew nothing about the man in front of her, she was moved by his deep affection. Taihua, who had always loved Jingshu, chose to leave quietly at this time, and Chengjun was finally able to be with Jingshu! However, at this time, an accident happened!