Unstaffed coffee shops, ramen eateries and flower outlets are spreading across South Korea as owners turn to robots and self-service to overcome rising labour costs in a business model that relies on the widespread honesty of users.Such stores, usually open 24 hours, were estimated to number 9,000 nationwide by the end of 2024, the National Fire Agency said, while payments provider Samsung Card said their number probably grew four times by 2025 from 2020.“The population of baristas in their...