I wasn't too keen on Sympathy for Lady Vengeance either but note my list was barely scratching the surface of top Korean flicks.
I'm usually not too keen on Takashii Miike apart from '13 Assassins' because i find his movies a little too extreme in the violence department or that's the impression i got after watching 'Ichi the Killer'. However, the couple you mentioned are perhaps down my street.
I've seen Confessions and it was truly amazing - disturbing yes but i was enthralled and truly gobsmaked.
I've seen so many Hong Kong movies that if i listed them here we might encounter bandwidth issues!
I find Human Trafficking very fascinating but i've never seen anything of note on it so i appreciate your recommendations and also with your interest in documentaries it shows you have a more diverse interest of escapism than i have.
Some interesting French movies i've seen (you may have too lol):
Tell No One
Brotherhood of the wolf
A Prophet
Mr.73
Amelie
Nikita
Hidden (Caché)
Switchblade Romance
Wasabi
The Nest
District 13
Mesrine 1 & 2
36
Spanish: (not necessarily Spanish but Spanish language i think)
REC
Amores Perros
The Motorcycle Diaries
Pan's Labyrinth
Intacto
Other notable foreign movies i can think of are:
Let the Right One in
The Girl with The Dragon Tattoo
Troll Hunter