Yin Yu is the former Martial God of the West who was later banished from the Heavens and now works for Hua Cheng as a servant and assistant. He also used to be the guardian of Quan Yizhen. Yin Yu is a kind and quiet person. He has virtually no sense of presence to the point that very few notice him when mixed in a crowd. This has worked to his advantage as it allows him to sneak by others or infiltrate areas most would have difficulty.
(Source: Heaven Official's Blessing Wiki)
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