South Korean movies you must watch - Memories of Murder (Still Bong Joon Ho's best film, even better than Parasite), The Host, Oldboy, Sympathy for Mr. Vengeance, Lady Vengeance (the last three is a trilogy), The Handmaiden, The Wailing, The Chaser, The Good, the Bad and the Weird, Peppermint Candy. There's plenty more, but this is a good place to start!