Funny video: Hall idioms solitaire laughs.

There is a dagger hidden behind the smile ―― there is an intention to kill behind the smile.

Describe the appearance of being kind to people, but sinister.

[Pinyin]

Xidanchang avenue

[source]

"Biography of Li Yifu in Old Tang Dynasty": "The righteous house looks warm and respectful; Smile with people; Avoid dirty thieves. Be in power; Want others to be attached to themselves; Slightly caring; Don't rush in. So, when people joke with a knife; Also with its soft harm; Also known as' Li Mao'. "

[example]

In this way, the chairman smiled and drove manager Wang away.

[near meaning]

A snake in its mouth means what it says, but it doesn't mean what it says. ...

[antonym]

I have no heart, no brain, no heart, no heart.