How did Baili Tusu and Ouyang Shaogong turn against each other in The Legend Sword?

Less sharing of Xianzhi Soul Washing Pill turned Baili Tusu's mother Han Xiuning's body into Jiao Ming. After that, Lan Sheng took them back to Qinchuan to play. As a result, they were told that Qinchuan was a plague, and all the infected people went to the sapphire altar for treatment. Then Lan Sheng met Fang Ruqin and others who had become Jiao Ming in Qinchuan. Shaogong tore off his disguise and turned against him. Xue Qing took them to swim, and he met Han Xiuning's soul in Forgotten River. When he was a child, he revealed the secret of the village to his brother, which made Lei Yan and Shao Gong use the sapphire altar to slaughter everyone in Wumengling. Shaogong appeared. He drugged Qingxue, stole Qingxue, forced Baili Tusu to unlock the seal, and then went to Penglai to find him.

Ouyang Shaogong also led Yan's charm into the city, which made Ziyin retreat to protect Baili from harm. Zhao Lin was also killed by him. What he wants is the other half of Prince Chang Qin who killed countless people. One is to completely solve the dispute between the two, and the other is for justice.