Hirosuke Okuda (Matsumoto Runi), a young man who works for an advertising agency, visits customers with his predecessors, but unexpectedly reunites his first girlfriend of his youth in his company (Ueno Shuri). When Haojie (North Village craftsman Sea) was studying on the island of Jiang, the class suddenly turned to a lovely girl whose brain and motor nerves were not very bright (sunflower). When Zhenxu was bullied, Haosuke helped him decisively, and then they studied, chatted and kissed together, and their young relationship bloomed quietly in the sun until Haosuke suddenly moved away. Ten years did not cut off the thoughts of Hosuke and Zhenxu, and their love was filled with enthusiasm and temperature again. The two fell in love and became husband and wife. When everything seems to sail to the other side of happiness, Zhenxu's body suddenly weakens rapidly. Hirosuke doesn't know yet that he will discover a sentimental secret that he can't let go. This film is based on the original work of Yue Guzhi of the same name.