What kind of fruit is this?

This is an autumn-ripe herb fruit, which is common in corn or soybean fields. It is wrapped in a "coat" as thin as a cicada's wing, like a delicate little lantern. When ripe, longan-sized fruit is yellow and sweet. In Shuyang, Jiangsu, it is called "end-to-end" or "running end-to-end". Northerners call it "sweet boudoir", while southerners call it "shame fruit". This common wild fruit is very popular with the public. At present, the price on the market ranges from 10 yuan to 15 yuan.