靳允 / Jin Yun (Late Han)
靳允 / Jin Yun enters the wiki through Hanji 978 as the 范县 magistrate whom 程昱 persuades during 曹操’s 兖州 crisis. 吕布 has seized Jin Yun’s family, so the source frames his choice as both strategic alignment and family-hostage pressure.
Cheng Yu’s argument asks Jin Yun to compare leaders and conditions: Lü Bu is rough, 陈宫 is not treated as a durable ruler, and Cao Cao remains the actor with broader potential. Jin Yun then pledges that he will not have a second mind, ambushes 范仪 after Fan Yi enters Fan County, and keeps the county from turning.
The page is source-scoped because the episode also records 许众’s later criticism. Xu Zhong argues that Jin Yun had no settled lord-subject bond with Cao Cao and should have prioritized his captured mother, while the host resists turning that criticism into a universal rule.