白天不懂爷的黑
[bái tiān bù dŏng yé de hēi]
'The Day Does Not Understand Lord's Blackness' translates loosely to a statement regarding depth and darkness misunderstood or underappreciated. More directly it plays on 'You do not know my struggles' - where 'day' stands for general ignorance while referencing 'black/night' as one’s complex interior world.