最污的小哥哥最纯的小妹妹
[zuì wū de xiăo gē gē zuì chún de xiăo mèi mèi]
'The Dirtiest Little Brother, The Purest Little Sister,' which contrasts opposing personalities within a lighthearted playful manner - conveying a mix of naughtiness and innocence. This sort of title plays up a comedic or cute image in modern online language.