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. People are miserable. Welcome everyone who comes. Red and green welcome slogans are posted on the door panels, which make them change frequently and rapidly. People in Huaiqing Prefecture in the north of Henan Province scrimped on food and clothing, so they came up with a once-and-for-all solution: with a thin wooden board, the slogan "Protect the environment and keep the people safe" was written to welcome the Yuan Army, while the slogan "expel the Tatars and restore China" was written to welcome the rebel army. Whoever comes, it is economical and convenient to dig up the slogan of "Welcome Party". But I didn't expect this method to cause great disaster later.
On one occasion, Chang Yuchun, a general of Zhu Yuanzhang, led an army into Huaiqing Mansion. He was very happy to see colorful' re' signs posted at the door of every household in the city. But suddenly a gust of wind blew, and're turned over, and the opposite side was covered with slogans welcoming the Yuan Army. Chang Yuchun was furious and ordered the beheading of all those who hung two cards.
The "two-faced" that is often said now evolved from the "two-faced card" of Huaiqing House, but it still has a history of blood and tears.