Most common linear Alphabets

Korean alphabet
Hangul system alphabet.
There are 24 letters:
ㅂ ㄷ ㅈ ㄱ ㅃ ㄸ ㅉ ㄲ ㅍ ㅌ ㅊ ㅋ ㅅ ㅎ ㅆ ㅁ ㄴ ㅇ ㄹ ㅣ ㅔ ㅐ ㅏ ㅗ ㅜ ㅓ ㅡ ㅢ ㅖ ㅒ ㅑ ㅛ ㅠ ㅕ ㅟ ㅞ ㅙ ㅘ ㅝ

Note: There are also Hanja system characters that were borrowed from Chinese language and implemented in the Korean language (without modification) with Korean pronunciation.

Greek Alphabet
There are 24 letters:
Αα Ββ Γγ Δδ Εε Ζζ Ηη Θθ Ιι Κκ Λλ Μμ Νν Ξξ Οο Ππ Ρρ Σσς Ττ Υυ Φφ Χχ Ψψ Ωω