A national parcel delivery union has threatened a major walkout unless CJ Logistics agrees to hold talks with striking employees seeking better working conditions.
The Korean Confederation of Trade Unions courier union announced Monday it may stage an industry-wide walkout after February 21, unless CJ agrees to the latest demand.
Some 200 members of the union have been staging a sit-in at CJ's headquarters in Seoul, backing an ongoing strike by unionized CJ couriers since late December.
They have argued that management has pocketed most of the profits from recent hikes in delivery charges, while neglecting its responsibility to prevent unnecessary overwork.
CJ Logistics has sued the union on charges of property damage and obstruction of business.
Striking CJ Logistics workers are expected to hold another rally in the capital on Tuesday.
Thousands of members of the KCTU union, which include workers from the postal service and other major logistics companies, also plan to hold a joint protest in Seoul next week Monday to "prevent CJ Logistics' unfair profiteering and achieve the fulfillment of the social deal in preventing overwork," KTCU union officials said.