The most common Korean word for “okay” is 괜찮다 (gwaenchanta). There is one more word with a similar meaning — compare them below. 「okay」는 한국어로 괜찮다.
to be okay; to be all right
TOPIK 1 · adjective
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato