That's exactly how I would describe Utsukushii Kare. Based on a somewhat familiar trope, what made this drama pique my interest were the leading characters.
Timid and introverted Hira falls for the cold and untouchable "King" Kiyoi. It then follows their twisted connection and the moral dilemmas that each of them face.
It's 100% non-fluffy by the way.
The show never moved away from the "romance" aspect, which I unfortunately found boring. Narrated from Hira's point of view, we rarely leave his bubble.

Both Kiyoi and Hira had distinct personalities and personally, I felt that there was more room for growth and portrayal of their different facets. I am not familiar with the source material, so I might me wrong.
Hira in particular, looked a bit more lively and open during the latter half of the show, particularly after his time at college. He is definitely one of the most uninteresting protagonists I've ever seen, but there were not many characters or relations in the story to begin with. It looked almosy empty or crowded at times.
I particularly loved the portrayal of the characters in the final episode, thanks to the cast who did an excellent job. It was too rushed for my taste, unfortunately.
Overall, it's definitely worth a try if you are seeking some dramas which deal with the ugly truth of a few people out there.