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Jyutping jat1 kei4 jat1 wui6
Pinyin yī qí yī huì

Definitions (Wiktionary)
  1. phrase, idiomatic
    you should treasure every encounter, for it will never recur

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Jyutping jat1 kei4 jat1 wui6
Pinyin yī qī yī huì

Definitions (粵典–words.hk)
  1. 語句、外來語
    一生​人​只​遇到​一次
    once-in-a-life
    一期一会(いちごいちえ)
Definitions (Wiktionary)
  1. phrase, idiomatic
    you should treasure every encounter, for it will never recur