The most common Korean word for “wake up” is 일어나다 (ireonada). There is one more word with a similar meaning — compare them below. 「wake up」는 한국어로 일어나다.
to get up; to happen
TOPIK 1 · verb
sober up
TOPIK 2 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato