WELL I HAVE SEEN A LOT OF KDRAMA. BUT I HATE THE ONES WITH LOVE TRIANGLES.PLS SUGGEST SOME MORE KDRAMA WITHOUT ANY GEOMETRY.

SOME WHICH I HAVE SEEN ARE CITY HUNTER, HEALER, PINNOCHIO, ITS OKAY ITS LOVE.

ANY KDRAMA LIKE THESE WHICH DONT HAVE ANY TRIANGLE OR WHERE THE MALE OR FEMALE HEART NEVER WAVERS AND THEY DO NOT LIKE THE OTHER LEADS.

PLS A GOOD STORY LINE WOULD BE A BONUS TOO.

Faith - timeslip story where a docter from the present is kidnapped to the past and the worrier who did it, will protect her with his life
Goblin - a girl is destined to be the only one the great goblin will love and the only one who is able to kill him
Queen In Hyuns Man - timeslip story between an actress of the present and a scholar of the past
Masters Sun - a girl can see ghosts and is desperate about it. She meet a cold man. When she touches him, the ghosts disappear so she want to stay with him
W - Two worlds - a woman fall in love with a cartoon character and try to save his life
King2Hearts -a north korean female military commander and he is a south korean prince...they fall in love at the second sign and go through a lot of hardships

according to what you mentioned before this would suit your taste - no triangle, great storys, not too dark :)
These dramas contain romance, but it's not the focus, and I don't remember them having love triangle either. Both are very well-written.

- Evasive Inquiry Agency
- Harvest Villa
Shopping King Louis 
I Remember You
White Christmas

Cruel City

Angry Mom

Liar Game

Signal

I Remember You
Mm... I would DEFINITELY suggest Lookout (sometimes also called The Guardians) its a great drama (with suspense, comedy, and a little bit more of everything lol) It made me cry tons because of the amazing story line but there's only one love story on that one, involving Shinee's Key and the secondary female lead. Those two are really cute and funny to watch so you can check it you if you want.

Other dramas that I can think of could be: Suspicious Partner, Birth of a Beauty, Doctors, Good Morning Call, Heartstrings (oldie but goodie haha), It's Okay, That's Love (a must see), Shopping King Louis, Splash Splash LOVE and, The Girl Who Sees Scents.
Signal
Voice
White Christmas 
Bad Guys 
Circle 
Remember : War of the Sun 
Lookout / The Guardians 
Age of Youth - has romance but not really the main focus, just a nice background [?] storyline. No geometry lmao 
most of 2017 dramas are without Love triangles 

1- Voice
2- Come! Jang Bo Ri
3- Lookout
4- Descendant of the sun
5- oh! my Guem Bi
6- Perfect Wife ( Ms.Perfect)
7- Marriage Contract
8- Defenant
9- Let's Fight Ghost
10 - Duel
11- Man Who Dies to live
12- Fight For My way
13- Circle
14- Punch 2014
15- Signal
16- Remember: War of the son
17- Six Flying Dragons
18- A Tree With Deep Roots
19- The Village : Achiara's Secret
20- Yong Pal
21- Ghost ( Phantom) 2012
22- Mama Nothing To Fear
23- The K2
24- The Girl Who Sees the smells
25- Liar Game 2014 tvN
26- Healer
27- Pinnochio
28- Miseng  : Incomplete Life
29- God's Gift : 14 days
30- Tunnel 2017
31- Missing Nine
32- Chief Kim
33- Naked Fireman
34- Legend of The blue sea
35- WAnted SBS 2016
36- You're All Surrounded
37- TEN
38- Flames of Ambitions
39-  Beautiful Mind
40- School 2013
41- The Chaser 2012 SBS

there are more and more !
thank you all for your help. 
DOES my girlfriend is a gumiho has a love triangle?
 yusuf7016:
DOES my girlfriend is a gumiho has a love triangle?

Couple of years late :D, but nope it doesn't. 

Takes a bit for the love to be mutual though wink wink

Something about 1 percent

 DreXam:
most of 2017 dramas are without Love triangles 

1- Voice
2- Come! Jang Bo Ri
3- Lookout
4- Descendant of the sun
5- oh! my Guem Bi
6- Perfect Wife ( Ms.Perfect)
7- Marriage Contract
8- Defenant
9- Let's Fight Ghost
10 - Duel
11- Man Who Dies to live
12- Fight For My way
13- Circle
14- Punch 2014
15- Signal
16- Remember: War of the son
17- Six Flying Dragons
18- A Tree With Deep Roots
19- The Village : Achiara's Secret
20- Yong Pal
21- Ghost ( Phantom) 2012
22- Mama Nothing To Fear
23- The K2
24- The Girl Who Sees the smells
25- Liar Game 2014 tvN
26- Healer
27- Pinnochio
28- Miseng  : Incomplete Life
29- God's Gift : 14 days
30- Tunnel 2017
31- Missing Nine
32- Chief Kim
33- Naked Fireman
34- Legend of The blue sea
35- WAnted SBS 2016
36- You're All Surrounded
37- TEN
38- Flames of Ambitions
39-  Beautiful Mind
40- School 2013
41- The Chaser 2012 SBS

there are more and more !

Your list is very detailed and long. Thank you!!

Haha i know how it feels. Triangle love is very irritating to watch since it includes broken heart, cheating, affair, and innocent people getting hurt (family and children).

But trust me, most of them are just fiction. Loving another person (beside your partner) is very tiring and energy consuming, you will feel mentally weak.  And there is no guarantee karma won't hit your back lol.


So don't worry, just enjoy triangle love dramas/movies :D