手牵手不分离背靠背心不离
[shŏu qiān shŏu bù fēn lí bèi kào bèi xīn bù lí]
'Hand in Hand, Together; Back to Back, Hearts Apart' illustrates two contrasting aspects of relationship dynamics: unity vs distance. On the surface, people may appear inseparable but on an emotional level there can still be disconnects.