The most common Korean word for “stay” is 계시다 (gyesida). 「stay」는 한국어로 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