On September 13, shortly after the enforcement of the Yellow Envelope Law requiring main contractors to negotiate with subcontractor unions, SK Intellex and HD Hyundai Heavy Industries publicly expressed their willingness to engage in negotiations with the subcontractor unions. This development deviates from previous expectations that major companies would avoid negotiations and resort to litigation. As the second week of the law's implementation approaches, many are interested to see if more companies will follow suit in their negotiations with subcontractor unions.

SK Intellex has confirmed that it will engage in negotiations regarding demands from the country's electronic communication service labor union, specifically the SK Intellex branch of the Korean Confederation of Trade Unions. The union comprises both regular employees and special employment workers engaged in maintenance, logistics, and installation of SK Intellex products, boasting a unionization rate of 97%. SK Intellex has stated it will communicate sincerely with the union and union leader Lee Hyun-cheol has expressed optimism about the stability and legal framework for negotiations afforded by the new law.

The Yellow Envelope Law empowers subcontracted workers to negotiate their labor conditions with main contractors under specific circumstances where the latter holds significant influence over the former's working conditions. However, debates continue over whether wage issues can be a matter for negotiation given the nature of control exercised by main contractors. The union's request for negotiations for wage agreements in 2026 is notable, especially since past negotiations often saw the main company dictating wage conditions. This evolving landscape raises questions about the practical implications of the law and the potential for improved labor conditions for subcontracted workers in South Korea.