A poem that implies that a person is lying.

The poem is "but seeing Dan Cheng as blood red, who knows that false words are as clever as spring".

This poem comes from the famous work of Tang Dynasty poet Bai Juyi, Heaven Can Measure. "But seeing Dan Cheng as blood, who knows that a lie is like a spring" means: it seems like a pair of red blood loyalty, but who ever thought that it was all a lie.

These two poems reflect the abnormal relationship between people in feudal society and lament that the world is cold and human feelings are warm and cold, which is very profound. It can be used to describe people who are duplicitous and lie, and their fraud.