Japanese and Korean drama Tree in Heaven

Japanese and Korean drama “Tree in Heaven“ When the boy whose heart has been closed off for a long time thought with full joy the girl who sincerely impressed him with love and made him fall in love with her has accepted his promise that he will protect her for the rest of his life, but the girl suddenly rejected his sincerity with an apologetic attitude, and he could only watched the girl run away from him with tears in her eyes, the boy must feel as if his heart is broken.