Enemies always meet, and Liu Yuan (Ge You) and Li Qing (Xu Fan) are exactly like this. They first met in the United States. At that time, Li Qing had just arrived in the United States and was looking after a house for a Taiwanese friend. He ran into Liu Yuan, who was receiving a Chinese crew. After several visits, the two got to know each other superficially. Liu Yuan gave Li Qing a plane ticket and advised her to return to China, where her future would be better than here. However, Li Qing stayed in the United States and happened to collide with Liu Yuan's car a year later. By chance, Liu Yuan asked Li Qing to work in his travel agency, but the travel agency was involved in illegal immigration. Li Qing was in trouble and asked Liu Yuan not to contact her again in a rage. Unexpectedly, they met again a year later and started a cram school together. The two repeatedly reunited and separated. Until one day when they were old, there was an opportunity for them to express their feelings to each other.