The comic is exclusive to the Webtoon platform (app and website), where it’s available for free with ads or via a Fast Pass model. The author and publisher have not released official PDFs, and any PDFs you find online are unauthorized copies (piracy), which hurt the creator.
I understand you're looking for a guide to Lore Olympus (the popular Webtoon by Rachel Smythe) in PDF format. However, I need to give you a clear and honest answer: