The guardian of nature, "Yangru", was unable to have children because the earth's environment was gradually becoming harsh, so she came up with a way to find humans as "grafters" to protect the earth on their behalf.
However, the "grafter" Li Man died mysteriously due to illness. In order to find out the cause of the grafter's death, Yang Ru hired the grafter's nephew Chang Run and the female college student Chi Ling to investigate the truth together.
Purpose: Protect the environment