Hmm. I'm thinking that he might be Clio or one of the muses. And this might just be a random event and he didn't know that Calypso would get Hyungmin since after what happen with Odysseus and Calypso being warn of bringing a human hostage again. And Malta and the Muses have a heavy connection in thepresent day. They have MUzA( Malta's National Museum for Fine Arts) its a direct reference for Muses.

Is there any god responsible for storytelling and history? Chang hyun felt fishy to me since the first chapter, but the olympus is supposedly not meddling with humans in this context and is an isolated realm, so... who could he be, to be living in the human realm?