《外来媳妇本地郎》的故事依然围绕着康家这个热闹的大家庭展开。康伯和康婶这对老夫妻虽然年纪大了，但心思一点不少，尤其是康伯，总爱操心家里的大小事。这天，康伯发现家里的电费突然涨了不少，怀疑是有人偷偷用电器，于是开始了他的“侦查行动”。他先是偷偷观察每个人的用电习惯，甚至还半夜爬起来检查电器开关，闹得全家哭笑不得。

  Meanwhile, the younger generation of the Kang family also has their own troubles. Ah Zong and his wife, who have always been at odds with each other, have another argument over household chores. Ah Zong feels that his wife is too lazy, while his wife thinks Ah Zong is too picky. The two of them quarrel endlessly, and in the end, they even involve the whole family in their dispute. The atmosphere at home becomes tense, and everyone feels helpless about their constant bickering.

  另一边，康家的三儿子康祈耀和媳妇黄菲也因为工作上的事情闹了点小矛盾。黄菲最近工作压力大，回到家总是闷闷不乐，康祈耀想安慰她，却总是说不到点子上。两人之间的沟通出现了问题，黄菲甚至觉得康祈耀不够体贴。直到有一天，黄菲加班到很晚，康祈耀特意去接她，还带了她最爱吃的宵夜，这才让黄菲感受到丈夫的关心，两人的关系终于缓和下来。

  The most interesting part of this episode is the storyline of Ah Guang and his foreign wife, Diana. Diana, who has always been enthusiastic about Chinese culture, decides to learn Cantonese opera this time. She practices every day at home, singing loudly and even dressing up in opera costumes. Her antics amuse the whole family, especially Ah Guang, who can't help but laugh at her exaggerated performances. However, Diana's persistence eventually moves everyone, and even the initially skeptical Kang Bo starts to appreciate her efforts.

  这一集的最后，康家全家人坐在一起吃饭，康伯终于揭开了电费上涨的“谜底”——原来是冰箱老化，耗电量增加。大家听了都松了一口气，同时也觉得康伯的“侦探行为”既可爱又让人无奈。饭桌上，大家有说有笑，之前的矛盾也都在欢声笑语中化解了。康婶看着一家人其乐融融的样子，忍不住感慨：“家和万事兴啊！”