The heroine Lin Zhixia (nicknamed Xiaokui) met her neighbor Jiang Chen, who was three months older than her, for the first time in the summer when she was seven years old, in a bright sunflower field. With a sunny personality like a little sun, she inadvertently illuminated Jiang Chen's gloomy and depressed childhood due to family conflicts. When he was most lonely and helpless, Lin Zhixia became the only light he was willing to get close to.
But the good times didn't last long. Jiang Chen was forced to leave the town because of his parents' divorce. Before parting, the two made a promise to see each other again in the sunflower field. Over the years, they lost touch but never truly forgot each other.
Until Lin Zhixia finished her high school entrance examination and entered high school, she unexpectedly reunited with Jiang Chen on the new campus. As time has passed, he has become a silent, outstanding and highly-regarded academic leader, and she has also lost her childhood ignorance. The fate that has been intertwined for many years is turning again, and a deep feeling that is gradually awakened around Sunflower and the promise is quietly coming towards them...
Concept: campus redemption, two-way secret love