Explanation: Means Sungongfeisi, seeking illegal profits. Also as "the back of public to private." Source: Song Zhang commercial British "law enforcement": the "back of the public seek private gain by this invasion of endless fishing." Examples: Guo Shu Yun Pearl and Yu Guozhu ~ all models. "★ Qing Zhao Lian" Xiao Ting Guo and Liu Shu Miscellany "