Dan-jjan (단짠) fuses dan (sweet) and jjan (salty). It describes the addictive cycle where sweetness makes you crave salt, and salt makes you crave sweetness — so you never stop eating.
It is the organizing principle of modern Korean snacking, and the exact concept behind BBQ's newest chicken, FEEL & CRUNCH: a caramelized-onion sweet-savory coating that stays crispy.