be a wolf with a savage heart
The heart of wolf and beast is a later Chinese idiom, Pinyin is l á ngz ǐ sh ò UX ī n, which means that a violent person has a cruel heart, like a beast. It comes from Yu Yu's biography in the book of Jin.
Idiom explanation
It means that a violent man has a cruel heart, like a wild animal.
The origin of Idioms
Yu Yu's biography in the book of Jin states: "the heart of a wolf and a beast is frivolous and easy to move." We have to watch out for him.
Word usage
A person's heart is bad.
be a wolf with a savage heart
people 's feelings change with the circumstances - shì guò qíng qiān
one 's criminal conspiracy was unmasked - dōng chuāng shì fā
investigate sb . 's fault and try to punish him - yǐn shéng pī gēn