The most common Korean word for “one by one” is 하나씩 (hanassik). 「one by one」는 한국어로 하나씩.
one by one; each
TOPIK 1 · adverb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato
치즈감자