冤有头，债有主

Explanation: Injustice with injustice head, debt and the creditor. Metaphor to understand something, you must find the main man. 　　Usage: Complex sentence; as subject, object; containing derogatory 　　Source: "Resume light recorded," Zhuo Zhu look, said 'injustice has a head, debt has a master. '" Thesaurus:  Injustice own head, Zhaigeyouzhu