Evil spirits and undeads are different and the former is extremely special.
Usually, only powerful Beast Masters can possibly transform into evil spirits after death.
Beast Masters can only transform into undeads after their death, which clearly differentiates evil spirits from undeads.
This is why evil spirits never take on beast form.
Fang Mu originally wanted to ask about Liu Xi's situation before death, but he could genuinely feel that Liu Xi had little understanding of his previous life.
Moreover, when bringing up some things about his previous life, Liu Xi would unconsciously reveal feelings of reluctance and sadness.
This indicates that Liu Xi went through a lot in his previous life.
Just as Shu Liangjun had said, Liu Xi couldn't have been an unnamed nobody when he was alive.
If he really had been a nobody, Liu Xi couldn't have become a Handsome Rank Evil Spirit!