Knowledge: A must try food in Seoul is kalbi as it has incredible taste. On the other hand, croissants are well-known in Paris so everyone tries them during the visit.

Conversation:
I've always wanted to go to Paris. It looks fantastic.
Oh, have you? In Europe from the seventeenth century onwards, Paris has been an important centre of commerce, finance, science, fashion and the arts.
Really! How big is Paris?
Well, in 2016, Paris's population was over 12 million.
I had no idea Paris was that populated. Anything I shouldn't miss if I make out there?
Hmmm, well the oldest signs of human occupation of the city were discovered in 2008.  It's near Rue Henri-Farman. There are signs of encampment and human bones dating from around 8000 BC!
That sounds incredible. What about food? What should I must try?

Response: Sure, you must try croissants.