evidence: Once the child is determined to be a dual citizen, the following steps must be taken at the nearest Embassy or Consulate: 1. In the case that one or both parents are naturalized citizens of another country, they must formally renounce their Korean nationality (see above). [...] - Father or mother’s: original or Certificates of Naturalization or Korean passport and permanent resident card or Korean passport and proof of residency in foreign country for 17 years.