To solve this problem, Korean uses this letter:
.
When it starts a syllable, it is a silent placeholder consonant.
This lets us write o-hu as:

. The first syllable now begins with a consonant that doesn't get pronounced.
Here are some other Korean words that use the placeholder:

, meaning inside and pronounced an (that's the ah sound
for the vowel, remember?)

, meaning "right" (as in right-hand) and pronounced u (that's the u
sound in June).


, meaning "grace, suavity," and


, meaning "peace" or "well-being."