RECOMMEND THRILLER DRAMAS

Thriller dramas that will make me eager to see the next episode immediately 

I second Mr. Hiragii's classroom

Also: 

Doctor Prisoner

Trap

Children of nobody (must watch)

Girl from nowhere: the series (not for everyone. It was weird, but I enjoyed it)

Duel 

Save me

• Maou
• N no tame ni
• Signal
• Hello Monster
• Tunnel
• Voice
• Stranger (but after a few episodes starts to get interesting so you have to get through the first couple of episodes)
• Kazolu game