In most cases, Korean law enforcement officials promptly notify the Embassy about the arrest or detention of any U.S. citizen. The American Citizen Services section makes every effort to make an initial visit to the detainee soon after the arrest, with follow up visits periodically. However, the U.S. Embassy cannot assist prisoners with legal representation. Our job is to ensure that the arrested U.S. citizen is being treated fairly under local laws, understands the charges, has access to legal counsel, and has any special or emergency needs met to the extent possible. The Embassy can also keep a detainee’s relatives or friends informed of the situation if that is the person’s wish.
Here is a list of local attorneys who speak English and may be able help you with your legal problem: https://kr.usembassy.gov/u-s-citizen-services/local-resources-of-u-s-citizens/attorneys/