Some words stay in Hangul even in the subtitles. Knowing the meaning is half of it; knowing when it is said is the rest.
The words Koreans use with each other. Not in the dictionary, gone the moment you translate them - and they change how a conversation goes.
Words worth knowing
These do not go in and out of fashion. They explain how Korea works, and they will still explain it years from now.
These are the words fans actually hear, not the whole language. For the structured Korean underneath them, courses such as KoreanClass101 from Innovative Language pick up where this page stops.