The first day of the implementation of the 'Yellow Envelope Law' saw subcontractor workers from industries like automotive and shipbuilding actively demanding negotiations with primary employers. This law obligates corporations with substantial control over subcontractors to engage in negotiations, marking a significant shift for labor relations in South Korea. Major companies such as Hanwha Ocean and Posco have already acknowledged these demands and expressed willingness to negotiate, prompting a surge of activity from previously suppressed subcontractor unions, whose membership exceeds 100,000 individuals.

South Korea's President Lee Jae-myung commented during a video speech at the 80th anniversary of the Korean Confederation of Trade Unions, expressing hope that the Yellow Envelope Law would serve as a turning point for direct negotiations between subcontract workers and primary employers. He assured that the government would maximize its efforts to empower laborers to enjoy their related rights. Within hours of the law's enactment, various subcontractor unions began to formally request collective bargaining with leading firms, signaling the start of intensified action across multiple sectors including transportation, construction, and public service.

The public transport workers union and several others have also issued demands for negotiations on behalf of thousands of their members, emphasizing the essential role of these workers within their respective institutions. For instance, cleaning workers at universities have highlighted their importance in maintaining operational standards, while also pointing out that the educational institutions ultimately determine their working conditions and wages. This new landscape created by the Yellow Envelope Law symbolizes a potential shift towards improved labor relations in South Korea, allowing subcontractors a direct line to their true employers and redressing historical imbalances in the labor market.