The most common Korean word for “be” is 있다 (itda). There is one more word with a similar meaning — compare them below. 「be」는 한국어로 있다.
to be; to have
TOPIK 1 · verb · honorific: 계시다
to be; to stay (honorific)
TOPIK 1 · verb · honorific form of 있다 — use it for elders and customers
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato
치즈감자