There is currently a question with the tag, memories-of-murders: Who is the serial killer in Memories of Murders?
According to IMDb and Rotten Tomatoes, the English title of this movie is Memories of Murder (singular 'murder'). So the tag should be memories-of-murder.
Since memories-of-murders already has tag wiki info. I can't just edit the question's tag to memories-of-murder, as that info will not copy to the new tag. This is a request to merge or create a synonym of memories-of-murders » memories-of-murder.
EDIT: After posting this meta question, I've tried to post a question with the correct tag, memories-of-murder: What is the significance of the dialogue,"Have some meat before you speak" between Inspectors Park and Suh?
However, I can't submit the question with that tag and got this error message:
The tag [memories-of-murder] is too similar to [memories-of-murders]. If you think this new tag should be allowed, discuss it on meta.