Childhood sweethearts Jiang Xiang and Mu Zhiyu unexpectedly reunite in college. After not seeing each other for many years, he always regarded her as his sister, and she approached her bravely with her youthful thoughts in mind. The two joined hands with their friends to establish an animation studio, and their love quietly grew as they stayed together day and night. After Mu Zhiyu bravely confessed, Jiang Xiang faced his heart and started a passionate love affair. Just as life was heading towards a better life, Mu Zhiyu was accidentally diagnosed with a brain tumor. In order not to drag down her lover, she endured it alone and hid her thoughts.
