本宫不死那么永远是妃
[bĕn gōng bù sĭ nèi me yŏng yuăn shì fēi]
'If I don't die then you’ll forever be my concubine'. It's somewhat playful or teasing, often mimicking royal titles from ancient China dramas where someone is speaking authoritatively as royalty or nobility, emphasizing power dynamics in an ironic manner.