I rescued a little fox in my previous life.
When I was twelve years old after reincarnation, my grandfather suddenly said to me: "Your first calamity has come."
That night I was besieged by thousands of ghosts, and it was only through the desperate efforts of my grandfather and the Fox Fairy that I survived.
After the fox fairy left, my grandfather said to me: "She was your marriage in the previous life. You must marry her after you turn eighteen..."