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Jyutping lou4 saan1 zan1 min6 muk6
Pinyin lú shān zhēn miàn mù

Definitions (CC-CANTO)
  1. the real appearance of a person or thing; one's true chracters (idiom)
Definitions (粵典–words.hk)
  1. 名詞
    人​或者​事物​真正​嘅​本​質​,​源自​蘇軾​《​題​西林​壁​》​中​嘅​「​不識​廬山​真面目​,​只緣身​在​此​山中​」
    the true nature of someone or something; literally: the true face of Mountain Lu
    • 我今日終於睇出你嘅廬山真面目。
      我今日终于睇出你嘅庐山真面目。
      ngo5 gam1 jat6 zung1 jyu1 tai2 ceot1 nei5 ge3 lou4 saan1 zan1 min6 muk6.
      I have finally realize your true nature today.
  2. 近義詞
    真面目
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    the real and original face (or appearance) of someone (or something)
  2. phrase, figuratively, idiomatic
    the truth about a person or matter (that is not easy to recognize); the true nature of someone or something
Examples (粵典–words.hk)
  1. Cantonese
    我今日终于睇出你嘅庐山真面目。
    我今日終於睇出你嘅廬山真面目。
    ngo5 gam1 jat6 zung1 jyu1 tai2 ceot1 nei5 ge3 lou4 saan1 zan1 min6 muk6.
    • I have finally realize your true nature today.