The origin of the idiom is the shadow of Duke Liang of Qing Dynasty, Volume II: "Forgive me for complaining about the bitter days of my parents' life and death:' My parents will want to return and live with mistress.'
Book Shadow was written by Zhou Lianggong, a scholar in Qing Dynasty, with a volume of 10. June 30, 2020 10 was selected into the sixth batch of national precious ancient books list.