Satisfaction is a must
" You need to stop if you want to burn in the eighteen levels of hell," Lin Hui Ying could understand the anger that Zhai Chenguang was going through, she was never betrayed by anyone but she felt the same anger when she found out that someone killed her sister. Back then she too wanted to kill everyone and watch the world burn while she did that which was why she understood Zhai Chenguang's anger better than anyone.
But as a celestial master, she understood the consequences of giving in to that anger as well. Zhai Chenguang could not kill Scholar Wei because she did not have the right to do so, as a ghost who was lingering at the surface of the earth because of her regrets, she could not hurt or kill anyone, she wasn't even allowed to bring her own case to a celestial master, so how can she even think of hurting someone?