朕愿为妳血洒江山妃宁为皇厮守到老
[zhèn yuàn wéi năi xuè să jiāng shān fēi níng wéi huáng sī shŏu dào lăo]
It reads 'I (Emperor) am willing to spill blood for the empire for your sake, Empress vows to remain with me until death.' The phrase implies dedication, sacrifice, and a strong commitment between partners.