In that summer when gardenias were fragrant, Yan Xu, who had excellent grades and a sober and independent personality, stepped into the high school campus and discovered that Jiang Yu, who always competed with her for first place in junior high school and later transferred to another school, reappeared in her life as the first in her grade. The once sunny boy became taciturn due to family changes, wrapping himself tightly in a cold shell.
In the cafeteria at the beginning of the school year, Yan Xu accidentally "shared" and dropped the first stone in Jiang Yu's frozen heart. Running for class committee and taking final exams, the two are still highly visible academic rivals. Chen Haoyang, who has transferred to another school, hides his identity as a second-generation rich man and longs for sincere friendship. His appearance brings a different kind of vitality to the class.
The story turns quietly in the military training where sweat and sunshine are intertwined. When Yan Xu was embarrassed when she "shunned" during training due to nervousness, it was Jiang Yu's calm prompts that helped her out; when Jiang Yu unexpectedly revealed his inner softness with a song "Instant" during the song night, only Yan Xu understood the loneliness in his singing. The silent protection time and time again tells the unspoken concern.
At the same time, Yan Xu's good friend Chi Nian and Sunshine's He Jingnian are getting closer and closer during the fight, adding a different color to the story.
This is a story about growth and secret love. Yan Xu used her warmth and tenacity to melt the ice in Jiang Yu's heart bit by bit; Jiang Yu used his silent and meticulous protection to become Yan Xu's most reassuring support in his youth. Amidst the intertwining of academic pressure and hazy emotions, they walked through high school together and wrote a touching chapter called "Spring Preface on the River" in each other's youth.