SEOUL -- The text message, sent at 4:30 a.m., starts with an apology.
Pandemic spurs massive demand in courier services, and excessive workloads

Delivery workers at Lotte Global Logistics march after holding a ceremony at a logistics center in Seoul on Tuesday to join a strike organized by the union of nationwide delivery workers. © EPA/Yonhap/Jiji
SEOUL -- The text message, sent at 4:30 a.m., starts with an apology.