Which controversial K-drama should I watch and review next?

I'm nearing the end of my second Hate Watching video series, where I reacted to each episode of Nevertheless,. I've also done this with The Third Charm. It can be torturous at times, but a fun project.
Now it's time to vote on the next contender!
*By controversial, I mean that there is a drastic split in the reviews - people loving it and people hating it for whatever reason.
The Third Charm was controversial due to its promotion of toxic relationships and viewers not liking the leads.
Nevertheless, was controversial due to viewers not like the toxic player male lead, the drama's ending, and the overall plot.
I have some dramas in mind but feel free to add more.