This is kind of complicated because [u] is a rounded vowel, so it's slightly "labialized" even if it's not preceded by [w]. Additionally, English spelling rule

This is kind of complicated because [u] is a rounded vowel, so it's slightly "labialized" even if it's not preceded by [w]. Additionally, English spelling rules are complete insanity, and if an English speaker sees "uhan" they'd probably pronounce the 'u' as [ju:].