缠绵过后谁许谁地老天荒
[chán mián guò hòu shéi xŭ shéi dì lăo tiān huāng]
Expressed by 'Chánmián guò hòu shuí xǔ shuí dìlǎo tiānhuāng', it translates to 'After intimacy (often used for passionate romance), until the earth grows old and the sky decays (meaning until the end of time) who will make a pledge with whom?' It describes undying love and promises kept over lifetimes.