After traveling through the end of my life span, I change my life at the krypton level

Description

Traveling to the world of immortality, he becomes an old man.
My life is about to end, but fortunately I can exchange my life with krypton level.
Retreat from the eighth level of Qi refining to the seventh level of Qi refining in exchange for ten years of life.
Although my realm has retreated, I am proficient in the art and my strength has not diminished.
The villain is unfilial and colludes with foreign thieves...