This is a story about youth and love. Xiaoxian, an orphan with congenital heart disease, grew up in a township welfare institution. When she had no money to study in high school and was about to drop out of high school, "Mr. Li", who had been quietly donating to the welfare institution for more than ten years, appeared and adopted her. She was able to go to high school in a big city and have a ruffian brother who was unruly and handsome. She has the first person she likes in her life, Zhong Jianyi, the first good friend Cindy, and the first person Li Jin who openly likes her. In this world that is completely different from her original life, she and their youth have experienced cruel tests. However, all happiness is just a dream, and no one has ever cared to cherish her life. When she decided to sacrifice her life to die in her brother's place, she discovered that the person who came to kill her was her lover.