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Applying the identity permutation on 3 2 1 5 4 gives 3 2 1 5 4 only and not 1 2 3 4 5. Hence the identity permutation can't be the inverse of 3 2 1 5 4. But if you apply 3 2 1 5 4 on 3 2 1 5 4 gives 1 2 3 4 5. Hence inverse of 3 2 1 5 4 is 3 2 1 5 4 and not 1 2 3 4 5.
Security Function Inverses
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Applying the identity permutation on 3 2 1 5 4 gives 3 2 1 5 4 only and not 1 2 3 4 5. Hence the identity permutation can't be the inverse of 3 2 1 5 4. But if you apply 3 2 1 5 4 on 3 2 1 5 4 gives 1 2 3 4 5. Hence inverse of 3 2 1 5 4 is 3 2 1 5 4 and not 1 2 3 4 5.