Okay, so, grabby hands at Johan in general.

Ardyn moves in different academic circles, but the academia thread is still there (as a professor of law) to draw a connection, if you're interested. Barring that, he also comes from a well-to-do family (though he doesn't keep in touch with them much any more.)

If none of that works, maybe they've simply just run into each other before, and know each other via acquaintance alone?