Before she died, she said to him: "You owe me a lifetime. If there is an afterlife, when I look for you again, you can't let me go!"
He was so choked that he couldn't speak and could only nod vigorously.
From this moment on, the entanglement of life after life becomes the fate of reincarnation. How many lifetimes can he remember the thought of loving her and caring for her?