How to buy USDT in South Korea?

I'm interested in purchasing USDT, the stablecoin pegged to the US dollar, in South Korea. Could you please guide me through the process of buying USDT in South Korea? I'm relatively new to the cryptocurrency world, so I'd appreciate it if you could provide a step-by-step explanation. Additionally, I'd like to know which exchanges or platforms are reliable and secure for purchasing USDT in South Korea. Could you recommend any? Thank you in advance for your help.