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──Notice regarding the sale of Professor Kim Kang-yong's [Grades and CSAT Preparation] textbook.── If you'd like to view Professor Kim Kang-yong's previously unpublished lectures, please purchase the paid textbook now. Leading students and instructors have already purchased it and are improving their skills. ▶For information on purchasing the paid textbook, please click the link below. https://blog.naver.com/dos20011/22165... ▶ Kim Kang-yong's Instagram: https://www.instagram.com/tomomath/?h... ▶ Apply for paid textbooks: [email protected] ▶ Premium Customized Class Information https://blog.naver.com/dos20011/22331... ▶ Add Kakao Channel http://pf.kakao.com/_FgzPG By adding the Kakao Channel, you'll be the first to see news about new textbook releases, math resources, and unreleased lectures. Seojin Publishing Business Registration Number: 753-15-00151 Mail-Order Business Registration Number: 2020-Seoul Seocho-4128