When he was a child, Ning Caichen asked his mother, since people can't see ghosts, how do they know whether they exist?
You burn paper money every year, but there is always no response. Aren't you disappointed?
His mother smiled and said, as long as you feel it is there, it is there.
It rains heavily during the Qingming Festival, and the sky is full of paper money to send to old friends.
Concept: The ghosts I was afraid of when I was a child are actually the people that others are thinking about.
