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