To become a saint, the immortal official called me to raise horses

Description

As a servant, Gu An accidentally broke a jar of spiritual flowers when he was young. When he was frightened, he found that he had seized twelve years of life!
A road of immortality spreads before Gu An!
In order to cultivate immortals safely, Gu An chose to become a tragic disciple of Taixuan Sect and plant herbs every day to seize the lifespan of the herbs for practice.
Through the evolution of lifespan, his basic skills have been continuously evolved, deduced from the basic methods into the magical power of the heaven!
Era changes, the times change, and the world changes.
The legend of immortals gradually emerged in the world.
Gu An, known as an immortal, spent half his life, helped his cultivation to cross the limit of the immortal path, attained the realm of a saint, and surpassed the heavenly path.
However, one day, an old man in white with fairy spirit came to visit Gu An.
"I am the Xuanqing Star Lord in the Heaven. Emperor Taihao heard that fellow Taoists do many good deeds in the world and saved all living beings on earth repeatedly. He has immeasurable merits. He specially sent me to the lower realm to summon fellow Taoists to be in the immortal class, serve as immortal positions, and the divine horse heavenly official."
"Dare you ask what is the position of the Heavenly Official of the Divine Horse?"
"There are divine horses in the heavenly court that can cross the heaven and earth and escape into yin and yang. The divine horse Tianguan is responsible for taking care of and feeding these divine horses."
Um? Raising horses?