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.