
The revised Trade Union and Labor Relations Adjustment Act, commonly known as the "Yellow Envelope Law," takes effect Friday despite unresolved core issues that have sparked concerns about workplace confusion and potential conflicts between management and unions—as well as among unions themselves.
According to the Ministry of Employment and Labor on Thursday, the government has issued detailed guidelines and interpretation directives to minimize confusion. However, industry officials warn that ambiguous standards will inevitably lead to significant disorder following implementation.
Experts predict a high likelihood of simultaneous legal battles between main contractors avoiding negotiations and subcontractor unions demanding them. Concerns are also mounting over intensified conflicts not only between labor and management but also between different unions.
Ambiguous Definition of 'Employer'

The revised law's most significant problem is the vague concept of "employer" used to determine whether main contractors must negotiate with subcontractor unions. The law defines employers only as those who "substantially and specifically control or determine workers' working conditions."
The labor ministry provided more specific criteria through interpretation guidelines, including work methods and wage systems. However, these lack legal enforceability, leaving room for both sides to interpret them favorably. The Korean Confederation of Trade Unions estimates approximately 130,000 members could demand negotiations with main contractors.
Expanded Bargaining Scope Raises Concerns
Union bargaining power is expected to strengthen significantly under the revised law. Companies, meanwhile, face the burden of potentially year-round negotiations.
Previously, labor-management negotiations typically occurred once every two years, aligned with collective agreement periods. The revised law expands the scope of labor disputes beyond wage and working hour issues to include rights disputes such as unpaid wages and reinstatement of dismissed workers.
Park Ji-soon, a professor at Korea University Law School, noted, "Original contractor unions are unlikely to welcome subcontractor unions demanding a share of the main contractor's resources."
Lee Seung-gil, chairman of the Korea ILO Association, said, "Conflicts between original contractor unions and subcontractor unions were predicted before the law's implementation. Negotiations will become more difficult with multi-tier subcontracting structures and different umbrella organizations."
Weakened Corporate Response Mechanisms
The bargaining and dispute rights of all unions, including subcontractor unions, are expected to strengthen substantially. The revised law limits liability for damages from illegal strikes, reducing employers' response capabilities.
The government has warned it will punish main contractors for unfair labor practices if they unreasonably refuse subcontractor unions' negotiation requests.
The Korea Employers Federation on Thursday urged, "Labor must refrain from illegal activities during collective bargaining processes with main contractors."
Management Rights Under Pressure
Following implementation, issues such as layoffs from mergers and acquisitions and reassignments from restructuring could become negotiation topics. Demands for converting irregular workers to regular status may also reach the bargaining table.
Business groups view these changes as potentially subjecting all corporate management decisions to labor negotiations and disputes. Concerns are particularly acute in the petrochemical industry, where the government is pursuing restructuring.
Wage Negotiations Remain Contentious
Whether wage negotiations between main contractors and subcontractor unions are permissible will likely become a key issue after implementation.
The government's position is that main contractors cannot, in principle, negotiate subcontractor workers' wages since no direct employment relationship exists. Labor groups are pushing back, arguing that negotiation topics should be determined autonomously by labor and management.
The Korean Metal Workers' Union recently suggested in a statement that it may pursue wage negotiations with main contractors, noting, "Wage demands against main contractors are already recognized in the United States and Japan."




