I don't know why it happens, but the default Korean text of "project" namespace(wiki name: 행복위키) and proper namespace are broken.
It seems that wiki engine is not working well because EVERY Korean wiki I've ever visited has similar problems.
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Hello, you can fix that in Special:ManageWiki/namespaces
Which is https://happy.miraheze.org/wiki/특수:ManageWiki/namespaces/3000 and https://happy.miraheze.org/wiki/특수:ManageWiki/namespaces/3001
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True, but don't you have a backup to restore all of them, as it looks like the similar issues have happened across most non-English wikis?
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You can actually fix that at https://happy.miraheze.org/wiki/특수:ManageWiki/core (and if the namespaces show the same then at Special:ManageWiki/namespaces).