On a winter day at school, Su Qi and Zhang Junqing meet in the first snowfall on Qisong Slope. One is a well-behaved girl with excellent grades whose family has mapped out her life for her. The other is a troubled boy struggling beneath the shadow of his alcoholic father, his emotions constantly shifting. Like two snowflakes blown together by the wind, they are drawn to each other, yet held back by their own chains. The arrival of childhood friend Liang Yu and transfer student Jiang Penghan weaves the four teenagers' lives into a warm yet bittersweet melody. Caught between family, illness, and secret crushes, they try to grow closer, but in the blizzard called growing up, they ultimately head in different directions.