Based on a true story, Xu Qingci and Gu Yan grew up together and are the most familiar existences in each other's lives. Although Gu Yan was reserved and silent, he was like a ray of sunshine in spring, warming Xu Qingci; Xu Qingci was like the stars in the night sky, cold and distant. The two had a secret crush on each other, but never said it out loud. They accompany each other through the most difficult times and become each other's salvation.
Just when the two of them finally achieved enlightenment, Gu Yan was suddenly diagnosed with a terminal illness. He chose to hide his illness and forced Xu Qingci to give up by making it official to others. Gu Yan still loved Xu Qingci until the last moment of his life. After Xu Qingci lost Gu Yan, he understood his deep love and silent farewell, "Sui Sui, promise me, live well!" But without Gu Yan, how could Xu Qingci live? The light in Xu Qingci's heart went out, my lover died, and I died with him.