《明史·列传·卷一百六十七》
贞毓推托说不知道，郑国恼了，就带着贞毓直接闯入永明王住的文华殿里，威胁永明王，要查出主谋。
贞毓谢不知，国怒，因挟贞毓直入王所居文华殿，迫胁王，索主谋者。
Zhenyu said he didn't know, which made Zhengguo angry. Zhengguo then took Zhenyu directly to the Wenhua Palace where King Yongming lived and threatened King Yongming to find out the mastermind.