Not dumb at all so no worries :). And no need for KR phone at all. If you’re lazy, you can just use your FB or Apple ID to sign up. If not, just register with any email & no other extra verification needed. But if you already had global LZ account, go to your settings and switch the language to KR and it should lead you to the KR page (note that NME is only available in web form as its 19+, unless you purchase it, you won’t be able to access the story in app form). Hope it helps and feel free to reach out if anything is unclear:)

Lezhin is giving free pass for first 10 ten eps. Please check this link and support the author here. You just have to register & read it on web version (as 19+ manhwa isn’t avail via app) ! Any view is good for the author too.
https://www.lezhin.com/ko/comic/no_eurydice