薄荷不会凉柠檬不会酸
[bó hé bù huì liáng níng méng bù huì suān]
Inverts the expectation: mint would be cooling yet it won't be so (here means no cool feelings); lemon tends to be sour but here it is said not, expressing that no matter what happens there’s no bitter taste left, maybe indicating remaining neutral or optimistic.