I understand the direction his class change is going now. It will almost definitely be a class that extends the part that allowed jinwoos shadows to revive infinitely to himself. I think it will also allow him to either grow stronger with every death in exchange for something like a larger mana usage after every death or something like making it also reset after every battle or something like that. All signs seem to point to this so far(being close to death before entering, having infinite revives, needing to become stronger to beat the seemingly impossible opponent, etc) but I could be wrong. For now, we wait.