Childhood friends Jiang Xiang and Mu Zhiyu unexpectedly reunite at university. After years apart, he has always regarded her as a younger sister, while she carries the feelings she has secretly cherished since their youth and bravely takes the initiative to get closer to him. Together with their friends, they establish an animation studio. As they spend their days side by side, affection quietly blossoms between them. After Mu Zhiyu courageously confesses her feelings, Jiang Xiang finally acknowledges his own heart, and the two embark on a passionate romance, each choosing the other. Just as their lives are beginning to look brighter, Mu Zhiyu is unexpectedly diagnosed with a brain tumor. Not wanting to become a burden to the man she loves, she silently endures everything alone, keeping her worries hidden.