A district or gu is an administrative unit in South Korea.
Ilsan-gu → Ilsandong-gu, Goyang (16 May 2005)
Buk District → Bupyeong District, Incheon (1 March 1995)
Jung-gu → Wonmi-gu, Bucheon (1 February 1993)
Nam-gu → Sosa-gu, Bucheon (1 February 1993)
Happo-gu (합포구; 合浦區), Masan (1 July 1990 – 1 January 2001)
Hoewon-gu (회원구; 會原區), Masan (1 July 1990 – 1 January 2001)
Ulju-gu (울주구; 蔚州區), Ulsan (1 January 1995 – 15 July 1997)
Ojeong-gu (오정구; 梧亭區), Bucheon (1 February 1993 – 4 July 2016)
Sosa-gu (소사구; 素砂區), Bucheon (1 January 1988 – 4 July 2016)
Wonmi-gu (원미구; 遠美區), Bucheon (1 January 1988 – 4 July 2016)
List of districts in South Korea Wikipedia (Text) CC BY-SA