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Quan Yizhen[]
Quan Yizhen was his shidi when they were mortal. He first saw Quan Yizhen pick a fight with some of his other shidi and decided to take the boy in, seeing potential. Due to Quan Yizhen's anti-social personality, inability to understand social cues, and love of fights, he tended to get into trouble often and Yin Yu often had to clean up after him and apologize on his behalf. When Yin Yu ascended, he brought Quan Yizhen with him. Due to Quan Yizhen slowly surpassing him and Yin Yu losing worshipers and popularity to him, a deep and strong resentment manifested in Yin Yu towards him. He understood that Quan Yizhen did nothing out of ill intent and thus couldn't get openly angry at him, but the jealousy and the fact that Quan Yizhen didn't manage to pick up social cues strengthened his frustration with him. However, he still cared about Quan Yizhen and wanted to retrieve the Brocade Immortal immediately after he found out it was gifted to Quan Yizhen.
Unfortunately, this was also the day he couldn't repress his built-up resentment any longer and laid open his anger with him after Quan Yizhen embarrassed him in front of the other Martial Gods, even though he wanted to do good. Quan Yizhen was taken aback by this and didn't understand what he did wrong. The situation escalated, causing Quan Yizhen to harm several Gods under Yin Yu's command. Yin Yu was even driven so mad he told Quan Yizhen to go die. After Jun Wu stopped the situation, Yin Yu was banished.
While Quan Yizhen still admires and is deeply attached to Yin Yu, determined to find him and talk to him, Yin Yu has since been apprehensive of so much as meeting Quan Yizhen. While he stated that he hates Quan Yizhen it's debatable if he actually feels that way. Yin Yu is clearly uncomfortable with the affection Quan Yizhen gives and holds for him, but he frequently saves Quan Yizhen and when given the chance to become a God and murder Quan Yizhen, he declines as he understood he earned his title earnestly and didn't want to steal it from him. So, while Yin Yu might have deeply rooted resentment towards Quan Yizhen, it is still apparent that he holds care and a sense of responsibility towards Quan Yizhen.
Hua Cheng[]
His master with whom he is deeply loyal to due to the fact Hua Cheng saved him after he was banished to the mortal realm. He also helped him find Jian Yu's soul which had been filled with resentment and assisted him in crossing over to the other side. As a result, he will help Hua Cheng in any endeavor. While Hua Cheng has stated the only person he loves and cares for is Xie Lian, he has shown to trust and respect Yin Yu as a subordinate and treats him well, showing far less annoyance to him than any other character and doesn't seem too bothered by the closeness between him and Xie Lian as friends. While it is never stated why Hua Cheng went and saved Yin Yu after he fell to the mortal realm, it may be because he fell from the heavens similarly to how Xie Lian had and because he recognized Yin Yu's skills. When he survived his fight with Jun Wu, he continued to serve Hua Cheng, remaining by his side as his loyal servant.
Xie Lian[]
As the friend and later lover of Hua Cheng, Yin Yu shows utmost respect to Xie Lian. He frequently refers to him as his Royal Highness and the two get along quite well, especially since the two have both fallen from heaven. Xie Lian is deeply sympathetic to Yin Yu's past, understanding his frustration at being surpassed by his shidi Quan Yizhen and being wrongfully accused of a crime that he did not truly commit (though certain circumstances led to an unfortunate accident). When Yin Yu is tempted by Jun Wu but rejects the offer, Xie Lian himself is deeply moved and proud of Yin Yu and comforts Yin Yu over his frustrations. Overall, the two share a strong friendship.
Jian Yu[]
Jian Yu was Yin Yu's most trusted friend and servant who had a hatred for Quan Yizhen. Jian Yu hated how Quan Yizhen was of lower status and also because he often brought trouble to their sect and to Yin Yu. When Yin Yu ascended he brought both Jian Yu and Quan Yizhen with him. Later when Quan Yizhen became more popular and received more followers than Yin Yu, he became enraged and in retaliation gave Quan Yizhen the Brocade Immortal Robe for his birthday. When this incident causes Yin Yu's banishment, Jian Yu confesses it was his fault that Quan Yizhen received the Brocade Immortal Robe and not Yin Yu's and tried to defend his master's honor and receive punishment in his stead, to no avail as no one believed him. It is stated he later on descended to the mortal realm in banishment and died, becoming a spirit filled with resentment. Hua Cheng helped Yin Yu locate his spirit, remove his resentment and allow him to pass on. Ultimately, the two had a strong bond of understanding and trust, with Jian Yu often becoming angry for Yin Yu's sake and Yin Yu appreciating his loyalty but being frustrated with his temper and impulsive nature.
Jun Wu[]
Jun Wu cares absolutely nothing for Yin Yu. Though he knew of the true circumstances of what happened between Yin Yu and Quan Yizhen, he did not care enough to save Yin Yu or explain what happened, allowing the other officials to believe Yin Yu gifted the Brocade Immortal to Quan Yizhen on purpose and told him to kill himself in order to eliminate Quan Yizhen. When Yin Yu tried to help Xie Lian escape from Jun Wu's grasp, he attempted to bait Yin Yu to switch to his side by offering him a chance to ascend and be a God by stealing Quan Yizhen's spiritual powers. However, Yin Yu proved to have too strong of a moral character and refused. Jun Wu admitted he knew Yin Yu would reject and used the cursed shackles to subdue him, telling Xie Lian he felt and thought nothing of Yin Yu and is torturing Yin Yu to anger Xie Lian.