There is also no box to sgin in to nnid in the settings
No, Korean 3DS consoles didn’t use Nintendo Network.
You may be able to do this via a region swap? Though I have no idea if that would work or not, or what other side effects there would be. The official homebrew guide has a guide for this Region Changing - 3DS Hacks Guide. If you do attempt a region swap (do at your own risk), and it’s successful, please do report that back here. We’d be very interested to know if this works
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