Bai Chuan

He is the only Son of his family who had to secretly try to seek treatment with Wei Yiyi because when he was younger he was almost killed which resulted in Yunyao taking refuge in in his spiritual pool/ocean preventing him being able to rank up in cultivation.

Wei Yiyi instinctively feared Yunyao but Zixie told Gu Ruoyun told him it would be no problem to subdue her with the Ancient Divine Pagoda. Gu Ruoyun told him she would heal him if he could fufill her two requests. One Yunyao would belong to her and two he would be her subordinate.

After joining the Devil Sect he showed talent in pill refining so she entrusted Mo Yu to teach him.

When a member of Dark Yin Palace kidnapped him to lure out Gu Ruoyun he thought since they only knew each other a few days she wouldn't come save him but after she came he finally fully pledged his allegiance to Gu Ruoyun.

After meeting Tian Gu and seeing how he had an edge on opponents a rank above him Gu Ruoyun decided he should learns poisons instead of pill refining.