A botched tumbler promotion on the anniversary of a pro-democracy massacre unleashed a boycott, police investigation and political firestorm

When Starbucks Korea launched its “Tank Day” coffee promotion on May 18 — the day South Koreans commemorate the 1980 massacre of protestors in Gwan...

Payments at Starbucks Korea plunged over 10 billion won ($6.5 million) in the month of May, following a controversial promotion event criticized for evoking painful memories of…