A large number of workers and activists in Asian countries are set to mark May Day on Monday with protests calling for higher salaries and better working conditions, among other demands.May Day, which falls on May 1, is observed in many countries as a day to celebrate workers rights with rallies, marches and other events.In South Korea, more than 100,000 people planned to attend various rallies across the country in its biggest May Day gatherings since the pandemic began in early 2020, according to organisers.