Lin Jiu, who is staying with family friends, unexpectedly reunites with her childhood sweetheart, Shi Yanli. The young man seems aloof and taciturn, yet he protects her at every turn because of her delicate health. A little promise they made as children conceals years of longing. Together, they overcome one problem after another, and as they spend their days side by side, their feelings gradually emerge. Their ordinary moments are filled with a healing warmth, making their sweet, mutual devotion utterly irresistible.