It was just on one of the court-party days that You Meng went to see the King of Chu。He was bend-ing to pour wine for the king，when suddenly the king caught sight of him and got a surprise。Thinking that Sun Shu'ao had e back to life again，he asked him to be the premier again。And You Meng deliberately gave a positive answer，saying that he had to go home first，and consult with his wife before he made such a decision。
Three days later，You Meng came back to meet King of Chu again，and he said that his wife was opposed to this idea。Hearing that the wife would not allow her husband to be the primier，the emperor was even more puzzled。You Meng then explained，“take Premier Sun Shu'ao for example，he had gained mountainous achievements，but when Your Majesty obtained sovereignty over all the dukes，you forgot all about him，and Your Majesty，you forgot his widow and children too。They had to make out a living by collecting wood。”When the King of Chu heard this，he made a careful study of Meng's face，and found he was not Sun Shu'ao at all，he was only You Meng in disguise。
Then You Meng gave the king more details，telling him that Sun's family was in great difficulty。The King of Chu was deeply moved，and assigned Shu'ao's son an official post immediately。
Later on“the Actor Meng in Costume”became an idiom，referring to someone in disguise。And it can also be used to denote creativity deficiency of some literary and artistic works，which imitate others all along。