柔情凯子万人迷温柔马子万人迷
[róu qíng kăi zi wàn rén mí wēn róu mă zi wàn rén mí]
The username means 'A romantic guy/Kai that attracts thousands with his charm'. The repetition emphasizes someone who has a warm personality that attracts everyone. Here ‘Kai’ may be a particular name, and it could also just refer to 'a nice person'; while ‘ma-zi’ is slang for a kind person.