This is the completely renewed Sejong Korean Series edited by the King Sejong Institute and first published in 2022. The series consists of levels 1A to 4B, each divided into sublevels A and B. The centerpiece of the textbook series is the Student Book, with audio files available for download via QR codes printed in the books. The books contain an answer key and transcripts of the audio files. The Workbook contains exercises following the contents of the Student Book. The Extension Activity Book is an additional workbook with speaking and listening activities. The Vocabulary and Grammar Book provides additional explanations for grammar issues and lists vocabulary translated into English. The Teacher's Guide is a companion for lecturers. Please note: Levels 1A, 1B, 2A, and 2B of the Student Book and the Extension Activity Book are available as a Korean-only version and a Korean-English version.