Which cryptocurrency exchanges operate in South Korea?

I'm interested in exploring the cryptocurrency market in South Korea, but I'm not sure which exchanges operate there. Could you please provide me with a brief overview of the major cryptocurrency exchanges that are active in the South Korean market? Specifically, I'd like to know which exchanges offer a wide range of digital currencies, have a good reputation, and provide secure trading platforms. Additionally, if you have any information on the regulatory framework for cryptocurrencies in South Korea, that would also be very helpful. Thank you for your assistance.