For Pyeon Young-min, a 30-year-old co-founder and CEO of unstaffed convenience store chain Zerostore featuring zero- to low-sugar products, the brand’s rapid rise has been more about building a franchise model around consumers and store owners than riding the “zero” food trend over the past few years. “Our strategy was to prioritize price advantages, product selection and franchisee profitability from the outset, even if that meant giving up much of the headquarters’ distribution margin,” Pyeon