Though policewoman Hsie Wan-chin (Cynthia Yang Li-ching) is merrily planning for her wedding with fellow cop Wilson Tsiang (Lawrence Ng Kai-wah), he is having an illicit affair with her best friend, May (Moon Lee). When Wilson tries to break things off, May doesn't take it well. When she learns that Wilson and Wan-chin are moving to Though policewoman Hsie Wan-chin (Cynthia Yang Li-ching) is merrily planning for her wedding with fellow cop Wilson Tsiang (Lawrence Ng Kai-wah), he is having an illicit affair with her best friend, May (Moon Lee). When Wilson tries to break things off, May doesn't take it well. When she learns that Wilson and Wan-chin are moving to England, she completely loses it. (http://www.allmovie.com/work/a-serious-shock-yes-madam-270076)