Record producer Zhang Zhekai (Liu Yihao) and ace lyricist Song Yuanyuan (Chen Yihan) depend on each other for life. The two have had rough lives since childhood and have only each other as companions. They are relatives, friends, and seemingly destined to be the other half. Zhekai, whose father suffered from a serious genetic disease and was abandoned by his mother, was deeply afraid that he would get sick and die at any time, and never stepped out of the line of friendship to show his love to Yuanyuan. Seeing that Zhekai's condition worsened, he secretly decided to use the rest of his life to complete the finale between them, and then find a good man for Yuanyuan to entrust her life to. At this time, the successful, gentle and considerate doctor (Zhang Shuhao) appeared at the right time, making him the best person to take care of Yuanyuan, and the two developed their relationship step by step. Everything seemed to be going according to Zhekai's plan. However, the story is much sadder than what is written here...