姐妹变脸就像后宫甄嬛传
[jiĕ mèi biàn liăn jiù xiàng hòu gōng zhēn huán chuán]
Sisters Change Faces Just Like Empresses In The Palace. It refers to how quickly friendships between sisters (or friends) may change, comparing their shifting dynamics to dramatic plots found in palace struggle stories like the drama series 'Empresses in the Palace', suggesting rapid mood swings or unpredictable relationships.