The Acacia Gu was created by a woman who spent her whole life to save her husband from dying in the Ten Jue Physique. When it was almost completed, her husband died. After the woman was overjoyed and sad, she committed suicide and died. The blood flowed into the Gu, and the Acacia Gu was born.
Later, a person broke in and discovered the Albizia Julibrissin Gu, which led him to study for a lifetime and create his own flesh and blood reunion Gu.