Ewha Korean 1-2 is copyrighted by Ewha Womans University Press (first published 2010, revised editions 2015 and 2021). Uploading or downloading unauthorized PDFs violates copyright law in most countries (including the US, South Korea, Japan, and EU member states).
On eBay, AbeBooks, or Korean used book sites (Aladdin US), you can find Ewha Korean 1-2 for $10–15. Yes, it’s a previous edition, but grammar changes very slowly. The 2010 edition is still excellent. Ewha Korean 1-2 Pdf