Tang Bohu is smitten by the stunning beauty of Qiuxiang, the maid of Grand Tutor Hua, during his visit to a monastery in Suzhou. Stalking the maid, Tang's affections are finally reciprocated with three charming smiles. To approach the fair maid, Tang seeks work in the Grand Tutor residence as a study companion, and his talents win Hua's attention. As a frustrated suitor, he turns to his resourceful friend Zhu Zhishan for help.

梁丽琴的未婚夫胡明林被指控杀害了贾磊，然而梁丽琴坚信自己的恋人是清白的，她偷偷潜入了恋人所住的红蝙蝠公寓暗中展开了调查。贾磊的太太陈希玛行为举止十分诡异，梁丽琴觉得正是她红杏出墙谋杀了亲夫，可是梁丽琴并没有确凿的证据。
一次偶然中，梁丽琴发现邓希玛藏有一瓶毒药，这更坚信了梁丽琴觉得她就是幕后想凶手的信念。然而正当梁丽琴想要偷走毒药作为证据时，私家侦探艾东河阻碍了梁丽琴的计划，不仅如此，他还把一切都跟陈希玛和盘托出。陈希玛害怕自己的罪行暴露，于是联手奸夫老邓，两人约了梁丽琴来到家中做客，实际上是想要杀人灭口。