偷心女贼丢心男警
[tōu xīn nǚ zéi diū xīn nán jĭng]
'Heart-thieving Female Rogue, Heart-losing Male Cop'. This implies two sides or persons of an intriguing relationship; where she may be tricky, playful but endearing (like stealing his heart), and the other part could be serious like a cop but lost heart to this female rogue which means fallen love.