A black rain that was supposed to fall on a war country actually fell on the heads of Nan Qiao, Shen Shiyu and others who were supposed to be far away from each other, pulling them into a strange ancient country. What they thought was a social practice was actually involved in a huge conspiracy involving two time and space.
Nan Qiao: I am fighting the drought
Shen Shiyu: I am fighting against floods
Others: Me too
Purpose: Wish for world peace