In the deep winter of 1948, a writer (Jiang Wen) received a thick letter on the night of his 41st birthday. This letter was written by a dying woman, and it was about her love for him for nearly 20 years, but he knew nothing about it. 18 years ago, a 13-year-old girl fell in love with the writer who lived next door. After moving to another place due to family changes, the girl did not forget the writer. A few years later, the girl became a female student (Xu Jinglei) and returned to her original residence. As she wished, she had a relationship with the writer, but the writer had no impression of the female student who lived next door to him. The writer left for something and had no news since then. The female student gave birth to the crystallization of her and the writer in desperate waiting, and became a socialite who depended on a rich man in order to let the child live a superior life. A few years later, the female student became a woman, and when she met the writer she loved for many years again, the other party still did not recognize her.