S
This is the consonant "si-os". It has approximately the same sound as English "s" but it lighter and less tense. It is written in two strokes and is similar to an upside-down "V." Note that this consonant will sound like a "t" when unreleased. Thus, for example, the name of the consonant ("si-os") will be pronounced as though it were spelled "si-ot." Note also that Korean does not distinguish between "sh" and "s". "S" will always be pronounced as "s" except before a high, front vowel ("i", "wi", "ya","ye", "yo", "yu") where it will be pronounced as "sh". There is one exception. "syey" is pronounced as "sey", and "swey" is pronounced as "shey".