What is "two-faced"?

People like "two-faced people" are always boring, but what kind of people are "two-faced people"? Some people say that "two-faced people" are always duplicitous, wear masks to be human beings, sow discord among comrades and dress themselves up as gentlemen in order to achieve their own goals. Actually, they are hypocritical.

Tracing back to the source, "two-faced" comes from a history of blood and tears in the Yuan Dynasty.

At the end of the Yuan Dynasty, the Yuan Army and the rebel army led by Zhu Yuanzhang launched a tug-of-war in the north of the Yellow River. The common people can't tell their pain. Anyone who comes should stick a festive slogan on the door panel to show a warm welcome, and it changes frequently and quickly. The people in Huaiqing Prefecture in northern Henan lived frugally, so they came up with a solution once and for all. A thin wooden board with slogans written on both sides welcomes the Yuan Army to "protect the environment and protect the people" and the insurgents to "expel Tatars and restore China". It is economical and convenient. When the slogan of any political party comes, dig it out and welcome it. But I didn't expect this method to cause great disaster later. On one occasion, Chang Yuchun, a general of Zhu Zhang, led an army into Huaiqing Mansion. When he entered the city, he was very happy to see colorful welcome signs on every door. However, a sudden gust of wind blew through the wooden sign on the gate, and the slogan welcoming the Yuan Army immediately came into view. Chang Yuchun was furious and ordered anyone who hung two cards to copy every word. The "two-faced" that is often said now evolved from the "two-faced card" of Huaiqing House.