About Korean (Hangul) letters
Hangul letters (jamo) are grouped into syllable blocks. The characters here are the standalone compatibility jamo; typing them in sequence with a Korean keyboard composes syllables such as 한 automatically.
The 2-set (Dubeolsik) layout is standard: consonants on the left hand, vowels on the right. Every OS includes it under Korean.
Pasting standalone jamo does not merge them into syllables; use the Korean keyboard to compose words.
Korean (Hangul) letters: names and codes
Every letter with its name and Unicode code point. None of these have classic Alt codes; in Word type the hex code and press Alt+X, or use the HTML code on web pages. Click a letter to copy it.