[USED] BTS Proof <Standard Edition>

This is the standard edition of BTS's "Proof." None of the contents have been removed. I opened it once upon receiving it and stored it in a place out of direct sunlight without displaying it in my room. I'm reluctantly putting it up for sale in order to raise funds for my move and to save space. I'm not a pen graduate, so I don't want to sell it cheap, but since it's used, I'd appreciate a small price reduction. Price negotiation is possible.