Bests of: Serial killer dramas - any country

I'd like recommendations about serial kilers dramas. Or crime dramas in general

It can be Chinese / Korean / Japanese or other countries.

Thanks :D

• Voice (season 1)
• Tunnel
• Mouse
• Hello Monster
• Ryusei no kizuna
• Signal
• N no Tame ni
• Beyond evil
• The Girl who sees smells
• He is psychometric
• Sketch
• Siren
• Nobody knows

 emeraldarrows:

• Blind 
• Come and Hug Me 
• Flower of Evil 
• Memorist 
• Psychopath Diary 
• The Game: Towards Zero 
• Train 
• No Secrets 

 Saygo:

• K-Drama
  • Through the Darkness
  • Signal
  • Life on Mars
  • Beyond Evil
  • Mouse
  • The King of Pigs
  • Strangers from Hell
  • The Killer's Shopping List
  • Chimera
  • Evilive
  • Voice
  • Flower of Evil
  • Inspector Koo
  • Somebody
  • Tunnel
• Chinese/Taiwanese-Drama
  • Under the Skin
  • Be Reborn 
  • The Victims' Game
  • Copycat Killer
  • Danger Zone: The Dark Night
• J-Drama
  • Gannibal
  • Signal: Choki Mikaiketsu Jiken Sosahan
  • Tokyo Vice

 fanitha:

• Voice (season 1)
• Tunnel
• Mouse
• Hello Monster
• Ryusei no kizuna
• Signal
• N no Tame ni
• Beyond evil
• The Girl who sees smells
• He is psychometric
• Sketch
• Siren
• Nobody knows

Thank you everyone! I've watched a few, but most of them I've never heard of! 

I'll have many dramas to watch! Thanks