(Apparently comment from Chensiyuan) 

 Well, when a user sees this article, he/she would immediately think: what's Water Margin?  I think at least half of a sentence of explanation would be necessary.  That's what I mean by context.  And if you think that I'm mercilessly criticizing, I apologize, but I think it should be noted that any merciless criticism is somewhat self-inflicted on your part.  It was you who demanded an explanation; I placed a cleanup tag on the article; that was it.   
 I am hoping that someone who's more familiar with the work than I am would pick up the job to clean up the article.  If no one does, I do plan to edit it myself later, but I am not familiar with the work.  It would be natural for someone who is to do so if that person is available  ergo, again, my placing of the cleanup tag.