1. Happiness comes from Liu Chan, the son of Liu Bei. People often think of happiness as forgetting their roots or their country for no reason, which is called happiness. This allusion originated in Luoyang during the Three Kingdoms period.

The concrete event of this idiom is that when Wei Jun entered Sichuan, Liu Chan, the ruler of Shu, surrendered and was sent to Luoyang. Si Mazhao named him the Duke of Happiness, gave him a house, gave him a monthly allowance, and had a hundred servants. Liu Chan made a special trip to thank him, and Si Mazhao hosted a banquet, singing and dancing. When the music of Shu started, the old ministers of Shu recited the sadness of the country's demise, and all of them burst into tears. Liu Chan, on the other hand, is insensitive and laughs. Say and then ask, do you miss Shu? Answered, this place is very happy, and I don't miss Shu.