During his youth, Zhang Ling was upright and selfless. He once served as the magistrate of Fengyi County. However, due to the emergence of monsters and evil deeds in Fengyi County, it caused a great loss of life and hardship for the people. Zhang Ling felt pain when he saw the monsters causing chaosFeeling heartbroken, he searched for immortality everywhere and eventually met the Supreme Old Lord. He taught Zhang Ling the Three Days of Righteousness and bestowed him with elixirs and artifacts, allowing Zhang Ling to go and eliminate harm for the people. After receiving the Three Days of Righteousness taught by the Supreme Old Lord, Zhang Ling received the Three Days of Righteousness from the Supreme Old LordHaving achieved success in cultivation, he joined forces with the chivalrous woman Yong Rong sent by the emperor to come to Fengyi County, eliminate monsters, save the common people, and be revered by later generations as' Zhang Tianshi '.