Well, no. You just brushed him off. You wont miss that much, though as Aelia said, you definatly will miss on couple of handy things. Well 1 thing at least heheh..
Haven't tried to edit the savegame flags to see if he comes back. However, just before you actually met Saemon, you did a small area change (from lower floor to upper floor), so unless you also changed some are where the game saved, you should still have the AutoSave, which can help you. But, if you changed any area at a later stage and game autosaved, then that's gone too.
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