 If you liked
Monster
|
 ...then you might like
Psycho-Pass 2
|
Both series have a "villain" whose existence is difficult to prove and thus, gets away with numerous crimes. The protagonists of the two series are similar too in the way that they are considered to be pure, golden-hearted persons. The question of whether or not they'll be tainted by hatred by the unfolding events makes both series more interesting.
If you want a more realistic and mature version of Psycho Pass 2, try Monster.