Where does “옛글” come from?

옛글 (Korean) comes from Korean 옛, from Middle Korean 녯.

Ancestry of “옛글”, step by step

옛글 traces back through two separate lines of ancestry.

via Korean

StepLanguageWordMeaning
1Koreanold; bygone
2Middle Korean

via Korean

StepLanguageWordMeaning
1Koreana piece of writing; a written work such as a book...
Every word from Middle Korean