As soon as school started, the sunny and cheerful Cheng Xu met the gloomy and quiet Su Weixi and became his deskmate. As they got along, he discovered that this girl who liked to draw ice butterflies on the windows suffered from severe depression and hemolytic anemia. Cheng Xu tried to warm her in various ways, but lost her forever on the eve of her senior year of high school graduation.
Purpose: Tenacity and hope in life