The most common Korean word for “now” is 지금 (jigeum). There is one more word with a similar meaning — compare them below. 「now」는 한국어로 지금.
now
TOPIK 1 · noun
now; from now on
TOPIK 2 · noun
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato