From the first time she saw Han Yi, Xu Mengxi was deeply impressed by the man in front of her. She knew that the person he had been thinking about was not herself, but his neighbor, a beautiful girl three years older than him, Lu Yiyi. For him, Xu Mengxi gave up graduate school, helped him start a business, and stayed away from home, just to stay with him and slowly enter his heart. Only five years later, Han Yi entrusted everything to Xu Mengxi and went to study abroad for a year in the country where his dream lover was.
On the day Han Yi returned to China from studying abroad, Xu Mengxi left her resignation letter and left the city. Little did she know that what Han Yi brought back from the UK were all the things she liked, and she didn't know that the person Han Yi had been thinking about most during her year in the UK was herself. The two met and got to know each other but missed each other one after another.
Han Yi, who finally understands his feelings, and Xu Mengxi, who chooses to avoid emotional pain, are once again separated from each other. Only this time, the person waiting at home is no longer Xu Mengxi, but Han Yi.
With the interference and help of Han Shi, Liu Yuqi, Meng Lu, Li Qingxu and others, maybe one day Xu Mengxi will return to the company again and knock on the door of Han Yi's office.