The idea for this feat was those people that could sell you sand in a desert. So charismatic that you want to do them favors even though, you maybe shouldn’t.
This feat doesn’t make the person believe that it wasn’t charmed, it just makes them believe you’re not the one behind the charm at all, or that it maybe was a temporary lapse of judgement on their end.
Some people might not like you at first, but your silver tongue is sure to turn them around slowly but surely. You gain the following features:
Your Charisma score is increased by 1 to a maximum of 20.
Whenever the charmed condition ends on a creature you charmed with one of your spells or abilities, you can make a Charisma (Persuasion) check, contested by their Wisdom (Insight) check, they have advantage on the roll. If you exceed their result, they do not think they were charmed by you.