Han Yu, the foremost of the 'Eight Great Prose Masters of the Tang and Song Dynasties,' had a son named Han Fu who was very playful in his youth and disliked studying.

Han Yu specially wrote a poem to educate his son, encouraging him to aspire to great achievements and rapid advancement. The poem contains the lines: 'Two families each bore a child, who as infants were alike; growing up, they played together, not unlike fish in the same team... At thirty, their skeletons formed, one became a dragon, one a pig; one soared swiftly like a magnificent steed, unable to care for the toad.'

The idiom '飞黄腾踏' comes from these lines, originally depicting the swift galloping of a magnificent horse, and later used to metaphorically describe a rapid rise in official position or social status.