WAIT before watching something after "Beyond Evil": subsequent series/movies will feel bland or boring. "Beyond Evil" (I don't like the title, hence I left it to watch it when there was nothing else on Netflix) requires concentration and you'll get rewarded BIG time.
One thing that is amazing is how you can at times barely guess what is going to happen. As a rule of thumb, you can't. Let yourself immerge in the events shaking fictional Manyang village next to fictional Munju town.
Unsure whether the lack of romance adds or detracts from the series. There was the possibility to develop something, and my bet would have been Oh JiHwa (ladies first) and ML DongShik as well as Yoo JaeY and ML JooWoon. The author chose not to.
The music fits both in terms of when it appears and what it sounds like.
"Beyond Evil" is another high light of 2021 kdramas, and bodes well for the future.