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