Korean Thrillers and Action Films

My introduction to Korean films started with Chan Wook Park's Oldboy. Ever since then I have been hooked on Korean thrillers and action movies. Sometimes dark, sometimes funny, often bloody, and always a good time. This list is comprised only of films I have seen, not all of them, but the ones I would recommend. Enjoy!
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1.
Oldboy (2003)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
After being kidnapped and imprisoned for fifteen years, Oh Dae-Su is released, only to find that he must find his captor in five days. (120 mins.)
Director: Chan-wook Park
“ As mentioned only seconds ago, this film was my first. And you never forget your first. Chan Wook Park might be the more known director to those not familiar with Korean cinema and for a good reason. His films can be nuts, but absolutely entertaining. Oldboy is pretty much cemented as a cult favorite and you have to watch it to understand why. ” - liketheadjective
 
2.
Memories of Murder (2003)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
In a small Korean province in 1986, three detectives struggle with the case of multiple young women being found raped and murdered by an unknown culprit. (131 mins.)
Director: Joon Ho Bong
“ Chan Wook Park may be my first, but Bong Joon Ho is hands down my favorite Korean director to date. His films are beautifully shot and his stories are amazing, driven by such interesting characters. Memories of Murder is beautifully understated and absolutely captivating. ” - liketheadjective
 
3.
The Host (2006)
    1 2 3 4 5 6 7 8 9 10 7.0/10 X  
A monster emerges from Seoul's Han River and focuses its attention on attacking people. One victim's loving family does what it can to rescue her from its clutches. (120 mins.)
Director: Joon Ho Bong
“ More of a monster movie than strict thriller or action film; The Host is great fun. Another of Bong Joon Ho's contributions and one that demonstrates his pitch perfect ability to mix humor into his usually dark films with out missing a beat. ” - liketheadjective
 
4.
Barking dogs never bite (2000)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
An idle part-time college lector is annoyed by the yapping sound of a near-by dog. He decides to take drastic action. (110 mins.)
Director: Joon Ho Bong
“ Not so much a thriller or an action film, I can't help but to mention another one of Bong Joon Ho's films. Dark, funny, and awesome as only Bong Joon Ho can be. ” - liketheadjective
 
5.
Mother (2009)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A mother desperately searches for the killer who framed her son for a girl's horrific murder. (129 mins.)
Director: Joon Ho Bong
“ The actors' performances take Mother from great to seriously impressive. This film is intense and will have you glued to your seat as you try to piece together the clues along with the title character. ” - liketheadjective
 
6.
The Chaser (2008)
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
A cash-strapped pimp and former police detective draws upon the skills of his old job to track down his missing stable of prostitutes. (125 mins.)
Director: Hong-jin Na
“ Hong Jin Na doesn't have much under his filmography and after seeing this film that will drive you insane. Once you see one of his films you are going to be hankering for more. The Chaser is down right thrilling, right up to the last second. ” - liketheadjective
 
7.
The Good the Bad the Weird (2008)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
The story of two outlaws and a bounty hunter in 1940s Manchuria and their rivalry to possess a treasure map while being pursued by the Japanese army and Chinese bandits. (139 mins.)
Director: Kim Jee-woon
“ This film is just plain fun and crazy. A Korean western; come on how awesome does that sound? ” - liketheadjective
 
8.
I Saw the Devil (2010)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A secret agent exacts revenge on a serial killer through a series of captures and releases. (141 mins.)
Director: Kim Jee-woon
“ I Saw the Devil may be one of the more dark, grisly films on this list, but Byung Hun Lee and Min Sik Choi rock their performances to an almost scary degree making this film very notable. ” - liketheadjective
 
9.
The Man from Nowhere (2010)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A quiet pawnshop keeper with a violent past takes on a drug-and-organ trafficking ring in hope of saving the child who is his only friend. (119 mins.)
Director: Jeong-beom Lee
“ The Man from Nowhere doesn't try to reinvent the wheel. It sticks with a formula that works and kills it in the process, no pun intended. Driven by a common redemption theme often seen in a lot of the movies on this list, it a greatly entertaining action film. ” - liketheadjective
 
10.
The Yellow Sea (2010)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
The story of a cab driver in Yanji City, a region between North Korea, China and Russia. His wife goes to Korea to earn money... (157 mins.)
Director: Hong-jin Na
“ Though not as resonating as "The Chaser", it still packs a punch in its own way. Hong-jin Na reunites his two leading men (Jung-Woo Ha and Yun-Seok Kim) from "The Chaser" in this film and that only makes me believe even more that these three must always work together. ” - liketheadjective