an unexpected gain
It's a Chinese idiom. The Pinyin is Qi ú Ji ā NGD é Ji ǔ. It refers to getting too much. It comes from the collection of court and field money by Zhang Zhuo of Tang Dynasty.
Idiom explanation
Pulp: drink. Metaphor is more than what you want.
The origin of Idioms
Zhang Zhuo, Tang Dynasty, wrote in the book of the court and the field: "when I was in Shenyou, I wanted to drink."
Idiom usage
To get more than is required
an unexpected gain
have talent but no opportunity to use it - lóng pán fèng yì