Since NewJeans' termination is contractually valid, any attempt to restrict their activities despite their disaffiliation with ADOR would violate South Korea's labor and fair trade laws, as governed by the Fair Trade Commission (FTC).  

Should ADOR assert that NewJeans remain their artists, imposing restrictions on advertising contracts would likely be deemed an unfair trade practice under FTC regulations or a violation of the individuals' rights.

Maybe (new) ADOR and HYBE has a thing for needing to violate the law lol