I'm looking for a thread for my friend who teaches at a middle school. Her co-teacher said the authors are lee seokjae and lee gijeong and that the text book name is Visang. She's teaching in Hoengseong.

Grade 1 textbook is mainly white but has a different author.
Grade 2 is yellow.
Grade 3 is green.

I know it's not much to go on but if anyone could help it would be greatly appreciated.
Thanks!!