Looking For K-Dramas For Beginners (No Romance Please!)

Since I'm learning Korean, I'm trying to get as much Korean media in my life as possible. However, I have no experience with K-Dramas, and as such would greatly appreciate recommendations.

I'm not particularly a fan of most romance dramas, or at least prefer it be a B-plot at most, so no-romance genres would be optimal. I'm actually learning Korean because of the novel "Omniscient Reader's Viewpoint", so if any readers are in this sub, dramas similar to that book would be excellent! I do also enjoy horror/mystery type stories in general, and dramas that focus heavily on character arcs (but not romance!). Also, what I'm looking for dramas with clear speech to supplement my lessons.

So, TL;DR, please share your favourite dramas with minimal romance and good audio quality.