姐妹一旦变脸就像后宫甄嬛
[jiĕ mèi yī dàn biàn liăn jiù xiàng hòu gōng zhēn huán]
Once my sisters-in-arms change their demeanor, it's like Empress Zhen Huan from 'Ruyi's Royal Love in the Palace'. Refers to dramatic changes or betrayals in relationships similar to those seen in historical dramas, especially the complexities found among women in royal courts.