Industrial accident application response... should I hire an attorney?

Yes, in the situation you mentioned, multiple laws including the Industrial Accident Compensation Insurance Act and the Serious Accidents Punishment Act may apply, and it appears to be a case where industrial accident application is also possible.

If a worker was seriously injured during work at the construction site, it is highly likely to be recognized as an industrial accident, and the injured worker can apply for medical care benefits to the Korea Workers' Compensation & Welfare Service.

In this case, the business owner must report the occurrence of the industrial accident to the Service without delay, and depending on the case, may bear civil damages or criminal liability (negligent injury, violation of the Serious Accidents Punishment Act, etc.).

In particular, since complex legal issues such as whether on-site safety management systems were established and whether accident prevention measures were implemented can be intertwined, from the business owner's standpoint, it is essential to organize the facts and prepare legal response strategies through a specialist attorney from the early stages.

Your parents need to take active measures to reduce future legal liability beyond just responding to the worker's industrial accident application.

To this end, please hire an attorney with rich experience in the field of industrial safety to minimize future legal risks.