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Jyutping lok6 joeng4 zi2 gwai3
Pinyin luò yáng zhǐ guì

Definitions (粵典–words.hk)
  1. 語句
    成語​,​形容​著作​好受​歡迎
    (idiom) to describe that someone's work becomes popular
    • 羅琳出名之後,佢嘅新作洛陽紙貴。
      罗琳出名之后,佢嘅新作洛阳纸贵。
      lo4 lam4 ceot1 meng2 zi1 hau6, keoi5 ge3 san1 zok3 lok6 joeng4 zi2 gwai3.
      J. K. Rowling's new novel is very popular after she became famous.

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Jyutping lok3 joeng4 zi2 gwai3
Pinyin luò yáng zhǐ guì

Definitions (CC-CEDICT)
  1. lit. paper has become expensive in Luoyang (because everyone is making a copy of a popular story) (idiom)
  2. fig. (of a product) to sell like hotcakes
Definitions (Wiktionary)
  1. phrase, idiomatic, of a literary work
    to be all the rage for a time; to be immensely popular
Examples (粵典–words.hk)
  1. Cantonese
    罗琳出名之后,佢嘅新作洛阳纸贵。
    羅琳出名之後,佢嘅新作洛陽紙貴。
    lo4 lam4 ceot1 meng2 zi1 hau6, keoi5 ge3 san1 zok3 lok6 joeng4 zi2 gwai3.
    • J. K. Rowling's new novel is very popular after she became famous.