Because it really is "love against all odds" in every sense of the word.
因为这是真正意义上不顾一切的爱。
词汇联想:
against all odds 克服重重困难
against all risks 全险
I think we'd better have insurance against All Risks.
我想我们最好还是投保一切险.
against all expectation 出乎意料
against all chance 毫无希望