Correct

绵里藏针

/ mián lǐ zàng zhēn /

Strokes

Definition

lit. a needle concealed in silk floss (idiom)/fig. ruthless character behind a gentle appearance/a wolf in sheep's clothing/an iron fist in a velvet glove

Example

Definition

needle hidden in silk floss—a ruthless character behind a gentle appearance; an iron fist in a velvet glove; a soft appearance but a dangerous heart