expression
if that's the case; in that case; if that's how it is
A colloquial phrase used to accept a situation or condition and proceed based on it. Often implies 'well then, if that's how things are...'
そういうことなら、私も協力します。
If that's the case, I'll help too.
そういうことなら、仕方ないね。
If that's how it is, it can't be helped.