Tā zài xiǎoshuō lǐ xiědào le yí ge péichàngnǚ de gùshi.
His novel tells the story of a KTV hostess.
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Refers specifically to women hired to sing and drink with KTV customers — a grey-zone profession in China, often (though not always) overlapping with sex work. The broader euphemism 陪酒小姐 covers similar work.