Not south korean but for me marriage just seems weird. Why should the government be involved at all in my relationship? Why would I do a bunch of paperwork and pay money to get a document that offers very few benefits and could one day become a pain in the ass if my partner and I grow apart for some reason?

If a partner cares about marriage there is nothing keeping me from swapping rings with them and doing a ceremony but I see no reason to get the government involved.