钟国成（黄霑 饰）、寅资初（林利 饰）、辜韩铎（黄光亮 饰）同在一间广告公司工作，钟个 风流，常流连风月场所。初与女友同居，但常独守空房。铎老婆对他事事管制，令他觉得枯燥。一日，三人被派往韩国汉城公干。初与铎欲随钟见识韩国之风月场所，钟警告二人一定要逢场作戏，不要动感情。在韩国，初邂逅欢场女子姬子，二人春宵一刻，竟难舍难分。而阿铎亦与朋友公司的经理贞子发生不寻常关系。经过一星期，生意洽商完毕，众人要返港，初与姬子在机场依依惜别，并把身上所有的金钱交给姬子，甚至回到香港，亦对姬子念念不忘。他未婚妻得知此事，一怒离去，初亦决心去韩国找姬子。但一抵机场，便发现姬子已另有新欢。

Chung, Yam and Koo work for the same advertising agency. Chung is a philanderer. Yam lives with his girlfriend who is a TV reporter, requiring irregular working hours. Koo's wife puts a tight leash on his social activities and this makes him feel bored. The trio are going on a business trip to Korea on the expenses of the company. Tasteless comedy ensues.