These are the lyrics
でも 全部わかってしまったらどうすればいいの.
My question regards the ii no at the end. The translation I found was that it means "But when I know everything, what do I do then?" So what does it mean exactly?
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でも 全部わかってしまったらどうすればいいの.
My question regards the ii no at the end. The translation I found was that it means "But when I know everything, what do I do then?" So what does it mean exactly?
I might say
but even if I wound up knowing everything, what should I do then?
My reasons for this different suggestion are two-fold.
の, with rising intonation, can be used to ask a question. Without rising intonation, it can be used to answer a question. You may wish to research "explanatory particles" which is what this is.
The question you quoted could be answered with:
全部わかってしまったら何もしなくていいの (If you wind up knowing everything, you should do nothing)
The question you quoted is equivalent (though with slightly different nuance / politeness) to:
でも 全部わかってしまったらどうすればいいのか (question particle か explicitly included)
でも 全部わかってしまったらどうすればいいのですか (polite)
でも 全部わかってしまったらどうすればいいんですか (の contracted to ん, to the best of my knowledge only if followed by だ or です)