what kmovie do best is thriller, so yeah my recommendation would include
memories of murder - i would never hesitate to recommend this masterpiece.
and then next is the vengeance trilogy. cant mention korean thirller movie without mentioning this trillogy. sympathy for mr. vengeance, oldboy, and lady vengeance - while not on the same level as memories of murder they are still one of the best revenge thirller out there.
3-iron - one of my fav movie and one of the best ive seen in my life. this is also the movie that got me into korean movie. its a very unique romance story and it really distinct itself further apart from other romance movie or even movie in general by having the two main character barely speaking any words through the entire movie, the soundwork and music in this movie just make it better.
breathless - the premise is nothing sort of grandiose, just a story of a run of the mill street thug and an ordinary highschool girl. but dont let that fool you, the atmosphere, the tension, the emotion, the swearing the message it carry are all more than deserve your time. and did i mention the swearing, this movie have so many swearing dialogue that you prob wont pass a min without hearing a single swear word. best slice of life movie imo.
other recommendation
- thriller : no mercy (it has such a fck up twist), house of the disappeared (its horror but actually more of a mystery and thirller)
- romance : addicted (prob gonna spook some romance watcher lul)