The loss of her family and tribe pushes an already vulnerable Sang Jiu into the demon side, where she exacts revenge on Tian Huan. Ming Ye intercedes, knowing she is in the early demonic stages and can still be redeemed. Tian Huan colludes with her tribe to inflict further damage, causing Sang Jiu to cross the point of no return. (Source: frankly at MyDramaList)