Pag-aaral ng wikang Koreano sa wikang filipino = 필리핀어로 배우는 한국어 [Text] / K.-s. Lee ; [planning Seo Min-woo ; editing progress, proofreading Jo So-young]... – Korea : Moonyelim, 2020. - 244 p. - Text in Filipino, Korean . . – [n. c.] – ISBN 978-89-7482-918-6 : 0 tg.
This textbook is purely grammar-focused for Filipinos who want to learn Korean systematically. I think that with this level of content, even a Filipino can study Korean from the basics on their own