
Elmond_u:
I wrote an essay about the insane villain character trope as used in Korean dramas with Vincenzo, My Demon, and It's Okay to Not be Okay as case studies. If you'd be interested in reading it, here's the Google doc link.
https://docs.google.com/document/d/12K25n2KwLuykGtEbXaHOg4nSrDeJ541U0BUTq5qc9vQ/edit?usp=drivesdk
I feel ya. One of my biggest complaints with Teen Wolf is that many of the villains felt so flat and thus boring (with the exception of season 3b >:3). Understanding a villains point of view can make them more compelling and can even increase the narrative tension if that underlying philosophy plays well with the lead's. My first favorite villain of dramaland was from Faith, and I liked him because I could understand why he was devolving into madness. He had this insatiable greed and loneliness that consumed and confused him. He's far from the standard of excellent villain writing, but he was the first to make me want more from writers of antagonists.
The Story of Ming Lan, as I've mentioned before, has some delicious villains. Each is complex with clear goals they are desperate to achieve. The Story of Yanxi Palace also has some fantastic villains and again part of that has to do with their own narrative archs surrounding their goals and well structed characterization. Love when it's done well. And of course, The Untamed's villains were all characterized to be multi-faceted, though some with more depth than others. It just adds something interesting to the story when we can get more from the villains.
That being said though, there are some villains we don't get much clarity on that are still pretty interesting. Oh My Ghost's villain is really just a malevolent spirit, and we don't learn much about its backstory. Still, I remember enjoying the protagonist's mysterious relationship with him anyway.