Responses
Its the human realm. And he's still human at that time. He can't stay longer or he might accidentally die. Zeus promise was only valid to Calypso. And when Hyungmin us on the god's realm. Anything that could happen to Hyungmin in the human realm is outside Zeus promise. And they have a law 'god's can't interfere in any human'. Kind of like that.
the story was mid, had crazy potential tho just felt rushed. he basically came back for only 1 year and then left as if it was nothing, as if it didnt equivalent to loosing his parents forever, death...he loved like he didnt care...