Many Seasons Doramas

Hello. Looking for doramas that just won't end like a villain in a 90's action movie, like Gokusen or Trick. 

Doramas that have at least 2 seasons and a bunch of specials. Genre whatever. 

Thank you very much in advance. 

Bloody Monday (2 Seasons, suspense)
Legal High (sadly only 2 Seasons because it's the most hilarious lawyer drama but at least it also has two specials)
Death Note (3 Movies, 1 Drama, and 2016, so this year, comes another revamped version)
Kamen Rider (it seems endless although I never watched it)

Aibou