A heartbreaking love story between Xie Jinyu, a girl with cancer, and Yan Fan, her childhood sweetheart.
Xie Jinyu gasped for breath and raised a hand to wipe the tears from the eyes of the man she cherished most. She spoke haltingly: "A... Yan... after I die... I'll become... a cloud in the sky... that heart-shaped cloud... made of love... You... you have to come see me every day... or... I might... get... get angry..."
Yan Fan gripped one of Xie Jinyu's hands tightly. His eyes were already red from crying, and he choked out, "Jin... Jiner... I promise..."
"A... A... Yan, then... it's... a promise."
Weakly, Xie Jinyu raised her hand and held out her little finger, wanting to link it with Yan Fan's.
Yan Fan held out his little finger too, but his hand was trembling. He kept murmuring, "Okay... okay..."
Their fingers were just about to meet when Xie Jinyu's hand fell limply. The monitor beside her gave a beep, and her eyes closed forever.
At last, Yan Fan could no longer hold back and burst into tears.
She became a cloud, staying by her boy's side forever.
And her boy watched over her every day.