樂不思蜀

From Sanguozhi, said by Liu Shan when he was living in Cao Wei after the collapse of Shu Han:

他日，王問禪曰：「頗思蜀否？」禪曰：「此間樂，不思蜀。」 [Literary Chinese, trad.]

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他日，王问禅曰：「颇思蜀否？」禅曰：「此间乐，不思蜀。」 [Literary Chinese, simp.]

From: Chen Shou, Records of the Three Kingdoms, circa 3^rd century CE

Tārì, wáng wèn Shàn yuē: “Pō sī Shǔ fǒu?” Shàn yuē: “Cǐjiān lè, bùsī Shǔ.” [Pinyin]

Another day, the prince (Sima Zhao) asked Liu Shan, “Do you still miss Shu very much?” Liu Shan replied, “I enjoy life here and don't miss Shu at all.”

樂不思蜀

1. (derogatory) to have so much fun that one forgets one's origins, or that one has to return; to indulge in pleasure and forget home and duty; to be too happy to be homesick