The last two syllables form an actual Korean word: 
which means "one." It's pronounced ha-na, as you probably already guessed.
(Note: when we write Korean words in English letters, we'll separate the syllables
with dashes.)
Here's another consonant:
It's pronounced somewhere between the k in king and the g in
guess.
We can use this consonant to write the Korean word for a persimmon: "kam."
It's a one-syllable word, but if we put all its sounds next to each other we won't
have a square box any more:
This problem is easy to solve: we stack up the
and
on top of the
so that it all fits into a square box:
So, learning the Korean alphabet is a simple matter of learning the letters and learning how to stack them up into a square box.