hal-mo-nee
* hal: The 'a' is like the 'a' in 'father', and the 'l' is a soft 'l' sound.
* mo: The 'o' is like the 'o' in 'go'.
* nee: The 'ee' is like the 'ee' in 'see'.
The stress is relatively even across the syllables, but perhaps a slightly stronger emphasis on the second syllable ('mo'). It's best to listen to a native speaker pronunciation online (many resources are available on YouTube or other language learning sites) to get the most accurate sound.