In order to fulfill the agreement with her first love, Zhang Lina (Crystal) flew from Beijing to Seoul. Lena, a stranger, meets Xianmin (played by Shen). Xianmin accidentally bumped into Lena while chasing Han Xianjun (played by Kim Soo Hyun) who was in debt. Later, Xianmin helped Lena find the address of her first love. But in the process, Hyun Min discovered that Lena's first love had passed away, and she wanted to come to Seoul to see her first love's family. Lena was very sad. Her first love family moved to America after her car accident. Xianmin hurriedly called Xianjun and asked him to replace Lena's first love brother. Hyun-jun can not only practice his acting skills, but also save Hyun-jun's debts. The three of them had a happy day, and Lena and Xianmin fell in love.

Xian Jun of the electric light bulb plays the younger brother whose first love doesn't exist, because Lena has only one sister.