不蛇蝎心肠怎陪你举世无双
[bù shé xiē xīn cháng zĕn péi nĭ jŭ shì wú shuāng]
Roughly meaning 'without a vicious heart, how could I be the matchless one by your side', it implies the complexity of love where even cruelty is deemed necessary to be uniquely compatible. A paradoxical and dark romantic sentiment.