Because it really is "love against all odds" in every sense of the word.
因為這是真正意義上不顧一切的愛。
詞彙聯想:
against all odds 克服重重困難
against all risks 全險
I think we'd better have insurance against All Risks.
我想我們最好還是投保一切險.
against all expectation 出乎意料
against all chance 毫無希望