"-구나" meaning in Korean

{
  "etymology_templates": [
    {
      "args": {
        "1": "bb",
        "2": "-고〮나〮",
        "3": "-kwóná"
      },
      "expansion": "First attested in the Beonyeok Bak Tongsa (飜譯朴通事 / 번역박통사), before 1517, as Middle Korean 고〮나〮 (Yale: -kwóná).",
      "name": "ko-etym-native"
    }
  ],
  "etymology_text": "First attested in the Beonyeok Bak Tongsa (飜譯朴通事 / 번역박통사), before 1517, as Middle Korean 고〮나〮 (Yale: -kwóná).",
  "forms": [
    {
      "form": "구나",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "-guna",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "구나 • (-guna)",
      "name": "ko-suffix"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "suffix",
  "senses": [
    {
      "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 redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Native Korean words",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "roman": "-gun",
          "word": "군"
        }
      ],
      "examples": [
        {
          "english": "Wow, the Jeju language is a really difficult language to learn.",
          "roman": "Jejueo-neun cham bae'u-gi himdeun eoneo-guna.",
          "text": "제주어는 참 배우기 힘든 언어구나.",
          "type": "example"
        },
        {
          "english": "You know this song too!",
          "roman": "I norae-do a-neun-guna!",
          "text": "이 노래도 아는구나!",
          "type": "example"
        },
        {
          "english": "Wow, this painting is so beautiful.",
          "roman": "I geurim-eun jeongmal areumdap-guna.",
          "text": "이 그림은 정말 아름답구나.",
          "type": "example"
        },
        {
          "english": "So he has passed away.",
          "roman": "Geu bun-i doragasyeot-guna.",
          "text": "그 분이 돌아가셨구나.",
          "type": "example"
        },
        {
          "english": "So you will be leaving soon, too.",
          "roman": "Jane-do got tteona-get-guna.",
          "text": "자네도 곧 떠나겠구나.",
          "type": "example"
        }
      ],
      "glosses": [
        "a plain-style exclamatory suffix used to express a certain feeling (surprise, wonder, admiration, etc.) upon discovering or hearing about a new fact."
      ],
      "id": "en--구나-ko-suffix-W6oehquE",
      "links": [
        [
          "plain-style",
          "w:Korean speech levels#Haera-che"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-구나"
}

{
  "derived": [
    {
      "roman": "-gun",
      "word": "군"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "bb",
        "2": "-고〮나〮",
        "3": "-kwóná"
      },
      "expansion": "First attested in the Beonyeok Bak Tongsa (飜譯朴通事 / 번역박통사), before 1517, as Middle Korean 고〮나〮 (Yale: -kwóná).",
      "name": "ko-etym-native"
    }
  ],
  "etymology_text": "First attested in the Beonyeok Bak Tongsa (飜譯朴通事 / 번역박통사), before 1517, as Middle Korean 고〮나〮 (Yale: -kwóná).",
  "forms": [
    {
      "form": "구나",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "-guna",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "구나 • (-guna)",
      "name": "ko-suffix"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Korean entries with incorrect language header",
        "Korean lemmas",
        "Korean suffixes",
        "Korean terms derived from Middle Korean",
        "Korean terms inherited from Middle Korean",
        "Korean terms with redundant script codes",
        "Korean terms with redundant transliterations",
        "Korean terms with usage examples",
        "Korean terms without ko-IPA template",
        "Native Korean words"
      ],
      "examples": [
        {
          "english": "Wow, the Jeju language is a really difficult language to learn.",
          "roman": "Jejueo-neun cham bae'u-gi himdeun eoneo-guna.",
          "text": "제주어는 참 배우기 힘든 언어구나.",
          "type": "example"
        },
        {
          "english": "You know this song too!",
          "roman": "I norae-do a-neun-guna!",
          "text": "이 노래도 아는구나!",
          "type": "example"
        },
        {
          "english": "Wow, this painting is so beautiful.",
          "roman": "I geurim-eun jeongmal areumdap-guna.",
          "text": "이 그림은 정말 아름답구나.",
          "type": "example"
        },
        {
          "english": "So he has passed away.",
          "roman": "Geu bun-i doragasyeot-guna.",
          "text": "그 분이 돌아가셨구나.",
          "type": "example"
        },
        {
          "english": "So you will be leaving soon, too.",
          "roman": "Jane-do got tteona-get-guna.",
          "text": "자네도 곧 떠나겠구나.",
          "type": "example"
        }
      ],
      "glosses": [
        "a plain-style exclamatory suffix used to express a certain feeling (surprise, wonder, admiration, etc.) upon discovering or hearing about a new fact."
      ],
      "links": [
        [
          "plain-style",
          "w:Korean speech levels#Haera-che"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-구나"
}