Can anyone back up your story?
네말을 뒷받침해줄 사람 없어?

[예문]
back up :뒷받침해주다, 후원하다

A:I told the teacher I was sick,but he didn't believe me.
  선생님께 아팠다고 말씀드렸지만,나를 믿지않으셨어.

B:  Can anyone back up your story?
 네말을 뒷받침해줄 사람없어?