We watched the Netflix show "Culinary Class Wars" https://en.m.wikipedia.org/wiki/Culinary_Class_Wars and the winner of it, Napoli Mafia, created a mozzarella burger for the Korean McDonalds which is called Lotteria. I walk by it often and after seeing the advertisement campaign I went in to try it. But it was sold out already. I tried a couple of more times but it's always sold out. But even the normal mozzarella burger is sold out. So they ran out of mozzarella for weeks now, while they have a bug advertisement campaign where they pay this guy probably a lot of money. Good for him :)