The most common Korean word for “specially” is 별로 (byeollo). There is one more word with a similar meaning — compare them below. 「specially」는 한국어로 별로.
specially; particularly
TOPIK 1 · adverb
specially; particularly; especially
TOPIK 2 · adverb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato