Could it be one of those? 


Bithumb (Founded in 2014) – One of the largest exchanges in South Korea, known for high trading volumes and supporting multiple cryptocurrencies.

Upbit (Launched in 2017) – Backed by Kakao, a major South Korean tech company, Upbit quickly became a dominant exchange in the country.

Coinone (Founded in 2014) – A well-known exchange in South Korea, particularly for its security measures and fiat-to-crypto trading options.

Korbit (Founded in 2013) – One of the earliest cryptocurrency exchanges in South Korea, offering KRW (Korean Won) trading pairs.

GOPAX (Launched in 2017) – A lesser-known but growing exchange that focused on security and compliance with local regulations

Hanbitco – A smaller exchange, but known for strong security and compliance.

ProBit – Launched in 2018, it grew in popularity for listing many altcoins.