I’m in the US so I’ve mostly watched US TV shows, I’ve been wanting to watch shows made by other countries as there must be some great ones that never took off in the states.
I’ve seen a few I could recommend like Alice in Borderlands (Japanese), Gangs in London (UK), Lupin (French)
Breaking Bad
Not foreign for OP.
The question was what my favourite foreign TV series is, not what my favourite one of their foreign TV series is