发誓爱你一辈子发誓护你千万世
[fā shì ài nĭ yī bèi zi fā shì hù nĭ qiān wàn shì]
Conveys an unending promise of eternal love, not only for this life but potentially beyond, into numerous other lives if they exist. It is hyperbolic yet powerful sentiment of commitment and undying devotion.