I'm looking for romance dramas without love triangles since it really turns me off.

Just pure romance between the main/supporting characters. If there is a triangle, at the very least, it's not the focus of the story(the other party clearly has no chance)

I really liked Oh my venus(it's so cute!) and Healer so anything similar would be great.

Thanks! :)

Queen In Hyun's Man
It's Okay, That's Love
Kill Me Heal Me
The Princess' Man
Secret
City Hunter
You Who Came From the Stars
Cruel City 
I Hear Your Voice
Pinocchio
The Master's Sun

Some of them have a love triangle but it's not the focus of the story. So it will not ruin your enjoyment.

That Winter, The Wind Blows
It's Okay, That's Love