Hello,

As an undergraduate student studying French and English law, I'd like to do my LLM in South Korea. However, even though I'm already learning Korean, I'd prefer for the LLM to be fully conducted in English. I was thus wondering if any of you has done an LLM in South Korea and in which university?

Thank you in advance!

You probably won't find many graduates here, as this is a forum for applicants. 

In general though your options for English-language LLMs in Korea are rather limited. 
I'm sure you've been through this list?
https://llm-guide.com/schools/asia/south-korea

That Northwestern program looks really interesting - it's run through a partnership with KAIST, which is a well known university in the country. With that program you'd get a couple of benefits: a well-designed LLM, plus networks in the US and Korea. 

SNU 2 year LLM is good. It is in english and has full scholarship options as well