A lawyer named Yau Yum-yum finds herself in the underworld, where she is authorized by the King of Hell to become the "Underworld Advocate," traversing both realms to defend ghosts in court while simultaneously investigating her own murder.

A suspect mysteriously disappears in Police Station's holding cell. Detective tries his best to catch him, but no clues. When at a loss, he receives news that the fugitive is found in the archives of the Police Headquarters in the city.

Amidst a rising wakesurfing craze, surf instructor Man (Renci Yeung) is falsely accused and publicly shamed online. Among the trolls is Chuan (Jeffrey Ngai), a surfing novice whose satirical video mocking her goes viral. Upon realizing the rumors were entirely fabricated and that he has ruined her reputation, a guilt-ridden Chuan signs up for Man's lessons under his real identity to make amends. As they connect beyond the digital noise, a genuine romance blossoms. To clear her name, Chuan devises a plan to expose the disgruntled student who started the smear campaign, while encouraging Man to reclaim her professional standing by challenging celebrity coach Joe (Kevin Chu).

《浪花男女》是首部以Wakesurf为主题的华语电影，故事讲述冲浪教练孙漫因网络谣言被公审，而一名原本对冲浪一窍不通的青年阿川，竟以网名“太平洋白鲊王”制作嘲讽短片并意外爆红。当他发现自己跟风嘲弄的对象其实被抹黑，阿川决定以真实身份向孙漫学习冲浪，由一个键盘黑粉，逐渐成为最努力为她平反的人。