A Certain Household

In all kinds of literary and film works, whenever the main characters travel through the wilderness, they always end up in a predicament with no water or food. When they need to find water and something to eat, a household will usually appear, and the main characters can knock on the door to ask for water or mooch a meal. Ningning is baffled. Why does someone always come knocking just after she finishes cooking? Theme: Warm hospitality.