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I am selling my Yonsei Books because I did graduate from level 6.
The books are only lightly filled by pencil and are in good condition.
As I did attend the Yonsei University course in Songdo from level 1-3, I have to those books too.
You can see all the available books on the picture (I have level 6 too but forgot to make a picture :))
I prefer selling in bulk of course :)