许你天荒地老为你画地为牢
[xŭ nĭ tiān huāng dì lăo wéi nĭ huà dì wéi láo]
'Xu Ni Tian Huang Di Lao Wei Ni Hua Di Wei Lao' (许你天荒地老为你画地为牢) implies promising eternal love and even restricting oneself just to maintain it, conveying intense and deep emotional commitment.