Along with China’s economic downturn, there has been an increase in the size of China’s underground lending market. The mounting risk in connection with this underground lending market triggers tremendous interest and debates over appropriate and effective regulatory responses. Because of its private and non-transparent character, the underground lending market is likely to confound those seeking to find “black letter” law governing its regulatory framework. Instead of relying on its conventional tighten-up strategy—using the muscle of the Criminal Law—China has orchestrated an experiment by allowing local legislation to formalize part of the underground lending market, as well as a judicial approach by recognizing a higher interest rate charged by underground lenders to borrowers. This article tries to understand the underlying rationale of regulatory and judicial movements through both law and society, and law and finance lens.