If you learn that your loved one is going to die, would you choose to see him suffer or spend your own life to extend his life?
Su Yu, who was as bright as a sunflower, would have left him at his birthday party on Chitose's birthday, but without any surprise, he lived for thousands of years and was still alive and kicking.
Bi Jin watched the child grow up like an elder. Although he still laughed with him as he did when he was a child, he could always catch a glimpse of the confusion and indifference in the child's eyes without noticing.
There seemed to be a natural chasm between them that could never be crossed.
Purpose: The past will never come back.