About a year ago, in Washington’s Mount Pleasant neighborhood, an independent grocer called Bestway changed hands. The new owner is In Suk Pak, a South Korean by way of Pennsylvania. He renamed the store Bestworld, replacing the second word of the big-block letters out front. Then he rejiggered the store’s product mix to fit the neighborhood’s changing demographics, adding gourmet chips and high-end beers, and Asian items like wasabi peas and dried seaweed.