Dramas/movies with a dark romance?

Basically anything goes.

Looking for everything ranging from redeemable leads  you can still justifiably ship together, to the exact polar opposite - the most tortured characters in toxic relationships that you ever did see. Sometimes it's more engaging watching unhealthy relationships develop than the healthy ones, though I love both.

Can include revenge plots, kidnapping/entrapment, psychological and/or physical abuse, and dubious consent.

• The Devil/Lucifer 
• Kenja No Ai
• Hateful but once again
• Memories if Bali

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• +1 Secret
• +1 Before We Get Married
• The Smile Has Left Your Eyes
• Empress Ki
• Misty
• The Princess's Man
• The Great Seducer
• The King's Woman
• The Rise of Phoenixes
• Bloody Romance
• Time

I'll only mention the ones that haven't been mentioned yet. I do think you've probably seen all of those already, but still...

Flower of Evil - ongoing

Born Again

Cheese in the Trap

Last Friends

Love in Sadness

Missing You -  the second lead, but his role is huge in this. 

My Heart Twinkle Twinkle

The Last Empress

When a Man's in Love

The Bridal Mask - second lead

Hot Gimmick

Failing in Love - somewhat on the innocent side, it's a triangle and I found that despite the light manner in which they've shown the romance, their relationships and feelings weren't healthy. 

The Discovery of Romance - the unhealthy part comes from the love triangle and the way it's being handled.  

Obsessed - a movie

I 2nd ‘Last Friends’ it’s an amazing drama