there's a reason why noah knows that emily and that man were the goddess' that's why noah was talking to him so casually, because they had already met before. i'm aware, noah's current status as a duke makes him a prince, but he was also a prince in a previous life, because even so, throughout the entire series, they havent mentioned his title as a prince, just a duke. and if im not wrong, this was mentioned a little bit more in the novel.
just because it wasn't too relevant, whale didnt add it into the manhwa i believe, because noah obviously knew who the goddess was in an instant, and had a friendly conversation and talk with him. there's a reason why noah knows that emily and that man were the goddess' that's why noah was talking to him so casually, because they had already met before. i'm aware, noah's current status as a duke makes him a prince, but he was also a prince in a previous life, because even so, throughout the entire series, they havent mentioned his title as a prince, just a duke. and if im not wrong, this was mentioned a little bit more in the novel.

So for some of you who don't understand, when the goddess said "Well it's not a lie, he was a former prince." She wasn't referring to how Noah is a duke right now, she was referring to the fact that Noah ALSO had a past life and got reincarnated like Raeliana, that's why he believed her so easily.