"真書" meaning in Korean

{
  "forms": [
    {
      "form": "jinseo",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "진서",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "hj",
        "hangeul": "진서"
      },
      "expansion": "真書 • (jinseo) (hangeul 진서)",
      "name": "ko-noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "jinseo, “true writing, Chinese characters”",
          "word": "眞書"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of 眞書 (jinseo, “true writing, Chinese characters”)"
      ],
      "id": "en-真書-ko-noun-LKNxKS3Z",
      "links": [
        [
          "眞書",
          "眞書#Korean"
        ],
        [
          "Chinese characters",
          "Chinese characters"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "真書"
}

{
  "forms": [
    {
      "form": "jinseo",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "진서",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "hj",
        "hangeul": "진서"
      },
      "expansion": "真書 • (jinseo) (hangeul 진서)",
      "name": "ko-noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "jinseo, “true writing, Chinese characters”",
          "word": "眞書"
        }
      ],
      "categories": [
        "Korean entries with incorrect language header",
        "Korean lemmas",
        "Korean nouns",
        "Korean nouns in Han script",
        "Korean terms with non-redundant non-automated sortkeys",
        "Korean terms with redundant script codes"
      ],
      "glosses": [
        "Alternative form of 眞書 (jinseo, “true writing, Chinese characters”)"
      ],
      "links": [
        [
          "眞書",
          "眞書#Korean"
        ],
        [
          "Chinese characters",
          "Chinese characters"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "真書"
}