If you're hunting for a legal copy of 'The Rejected Alpha Scarlett', I usually start by checking the big storefronts and webcomic/webnovel platforms first. Titles like this often get licensed to sites such as Webnovel, Tapas, Tappytoon, Lezhin, or even Amazon Kindle and Google Play Books, depending on whether it's a novel, web novel, or manhwa. I search the exact title in those stores and also look up the author or original publisher name — sometimes the English release uses a slightly different subtitle or spelling, so that helps.
If a direct storefront search turns up nothing, I check the original-language publishers (Korean, Chinese, or Japanese platforms like KakaoPage, Naver Series, or Qidian) because some works are region-locked and only later licensed for English. I always look for official tags: publisher logos, professional translation credits, or announcements on the creator's social accounts. Libraries via OverDrive/Libby sometimes carry official e-book translations, and BookWalker or Kobo can also have licensed editions.
One other trick that really works for me: follow the author or artist on Twitter/Instagram and check their pinned posts or links — creators often share where their work is officially available. Avoid pirate scan sites and fan translations if you want to support the creator; if you love the story, buying or subscribing legally helps ensure more translations and continued releases. I got a paperback of another favorite that way and honestly it felt great supporting the creator directly.