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Notice how most of the letters in the chart have two sounds
By first sound I mean the sound before the slash in the chart
By second sound I mean the sound after the slash in the chart
The first sound I think usually occurs if it is at the start of the tripartite syllable and no other syllable is before it
The second sound I think usually occurs if it is at the end of a tripartite syllable and no other syllable is after it
https://www.languagetrainers.com.au/blog/wp-content/uploads/2021/05/Korean_chart_03.jpg
@Stahesh
Here is how the names of the Korean letters are spelled both in Korean and in Romanization or spelled with English letters
Notice the connection between the last consonant in their Romanized spelling and the second pronunciation in the previous chart I showed you
Depending on your point of view there is a possible exception with the silent letter because you can not spell the pronunciation of being silent in English letters.
https://www.languagetrainers.com.au/blog/wp-content/uploads/2021/05/Korean_chart_01.jpg
https://www.languagetrainers.com.au/blog/korean-letters/