Korean 1985 Korea Unified Coordinate System - EPSG:5178

WKT

PROJCS["Korean_1985_Korea_Unified_Coordinate_System", 
	GEOGCS["GCS_Korean_Datum_1985", 
		DATUM["D_Korean_Datum_1985", 
			SPHEROID["Bessel_1841", 6377397.155, 299.1528128]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 1000000.0], 
	PARAMETER["False_Northing", 2000000.0], 
	PARAMETER["Central_Meridian", 127.5], 
	PARAMETER["Scale_Factor", 0.9996], 
	PARAMETER["Latitude_Of_Origin", 38.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Korean_1985_Korea_Unified_Coordinate_System", 
	BASEGEOGCRS["GCS_Korean_Datum_1985", 
		DATUM["D_Korean_Datum_1985", 
			ELLIPSOID["Bessel_1841", 6377397.155, 299.1528128]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 1000000.0], 
		PARAMETER["False_Northing", 2000000.0], 
		PARAMETER["Central_Meridian", 127.5], 
		PARAMETER["Scale_Factor", 0.9996], 
		PARAMETER["Latitude_Of_Origin", 38.0]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "5178"]]

Data from @esri/proj-codes

{
  "wkid": 5178,
  "latestWkid": 5178,
  "gcsWkid": 4162,
  "macro": "PE_PCS_KOREAN_1985_UNIFIED_CS",
  "name": "Korean_1985_Korea_Unified_Coordinate_System",
  "wkt": "PROJCS[\"Korean_1985_Korea_Unified_Coordinate_System\",GEOGCS[\"GCS_Korean_Datum_1985\",DATUM[\"D_Korean_Datum_1985\",SPHEROID[\"Bessel_1841\",6377397.155,299.1528128]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",1000000.0],PARAMETER[\"False_Northing\",2000000.0],PARAMETER[\"Central_Meridian\",127.5],PARAMETER[\"Scale_Factor\",0.9996],PARAMETER[\"Latitude_Of_Origin\",38.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Korean_1985_Korea_Unified_Coordinate_System\",BASEGEOGCRS[\"GCS_Korean_Datum_1985\",DATUM[\"D_Korean_Datum_1985\",ELLIPSOID[\"Bessel_1841\",6377397.155,299.1528128]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",1000000.0],PARAMETER[\"False_Northing\",2000000.0],PARAMETER[\"Central_Meridian\",127.5],PARAMETER[\"Scale_Factor\",0.9996],PARAMETER[\"Latitude_Of_Origin\",38.0]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"5178\"]]",
  "description": "Korean 1985 Korea Unified Coordinate System",
  "authority": "EPSG",
  "version": "7.5.6(10.1.0)",
  "deprecated": "no",
  "areaname": "South Korea - onshore",
  "extent": {
    "slat": 33.14,
    "nlat": 38.64,
    "llon": 124.53,
    "rlon": 131.01
  }
}