不关紧要

rú guǒ nǐ zài hu jiāng qíng kuàng gǎi shàn nà me shéi duì shéi cuò bù guān jǐn yào

如果你在乎将情况改善，那么谁对谁错不关紧要。

It doesn't matter who is at fault, if your concern is to make things better.