15歲郡哥找大款西門慶借錢養爹，街人皆指在王婆茶房與金蓮幽會。 郡哥前來，王婆阻攔, 打跑郡哥。郡哥報仇尋武大，告他西門金蓮偷情。武大不信要一起捉賊。

Junge, a 15-year-old boy,  is looking for Ximen to borrow money taking care of his dad.  The folks guide him to Wang’s teahouse where Ximen and Jin are secretly fooling around. Junge comes over,  Wang, the doorkeeper,  beats him away.  To revenge, Junge finds Wu, tells him his wife and Ximen cheating together, Wu doesn’t believe it, wants to catch the cheaters.