The most common Korean word for “later” is 나중 (najung). There is one more word with a similar meaning — compare them below. 「later」는 한국어로 나중.
later; after
TOPIK 1 · noun
later; in a little while
TOPIK 1 · adverb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato