Any  good dramas like Stranger, The guest, signal, Beyond Evil, Children of Nobody etc.  I have seen almost all the mainstream ones with mystery, thriller, suspense elements. Looking for any hidden gems.

If its genre pure like investigation or crime procedural kindly suggest. 

My recommendations are based on the ones you haven't seen according to your watchlist

For korean dramas:
Watcher 
365: Repeat the year 
Misty 

For chinese dramas:
Burning Ice
A Murderous Affair Horizon Tower
Day and Night
Burning River
Also since you did watch the Bad Kids. Give some of the other Light on Series also a try. I personally absolutely loved Gold Panning and for me this is the best drama of 2022 so far. But it is not something for everyone. However since you enjoy thrillers and suspense dramas it might also be something for you ;) Other recommendations in regards to the Light on Series would be; The Long Night and Kidnapping Game.

Taiwan dramas:
Victim's Game

Japanese Dramas: 
Aku no Hado (Evil's Wave) 
Ishi no Mayu 

I have watched Bad Kids from Light On series. It was good. I'll catch up with others.

Kdramas:

  • Voice
  • Tunnel
  • Children of a lesser god
  • Nobody knows
  • Circle
  • Duel
  • Solomon's perjury
  • Mouse
  • Flower of evil
  • He is psychometric
  • The girl who sees smells


Jdramas:

  • Maou
  • N no tame ni
  • Kazoku game
  • The Quiz show 2
  • Black pean
  • Ryusei no kizuna
  • Boku dake ga inai machi
  • Yokoso wagaya e
  • Siren