The most common Korean word for “traditional market” is 시장 (sijang). There is one more word with a similar meaning — compare them below. 「traditional market」는 한국어로 시장.
market
TOPIK 1 · noun
traditional market
TOPIK 1 · noun
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato