It is drawn from the classic novel A Dream in Red Mansions, the 27th chapter the Concubine Yang Fluttered Butterflies in the Di Cui Pavilion. The character in the novel Bao Chai saw a pair of funny jade-like color butterflies flying ups and downs, and attempted to flutter it. But the butterflies flying here and there to cross the trees, they were hard to be chased, which made Bao Chai running back and forth. That’s why Bao Yu teased her as Concubine Yang who was chubby and easy to sweat.