From IBWiki

Romanization of Corean in Ill Bethisad

The main romanization system for Corean in IB is known as the Johnson Romanization after its founder. Several older systems existed, and these romanizations are sometimes preserved in the names of Corporations or Corean immigrants.

Consonants:
Aspiration shown by a suffixed h (e.g., th instead of *here*'s t')
L/R written as l or r, but never as n or null
Ng is written as Ñ
Apostrophes are used to disambiguate
Apostrophe used to indicate glottalized stops (doubled in most romanizations *here*) Everything else is the same as *here*'s McCune-Reischauer

Vowels:
McCune-Reischauer to Johnson
E -> Ei
Ae -> Ai
Wi -> Ui
Oe -> Oi
ŭ -> Y (u-breve)
ŏ -> E (o-breve)
Y and W are writen as i and u
All others the same

Summary (first column is Johnson, second is *here*'s McCune-Reischauer, third is *here*'s South Korean Revised Romanization)

Vowels

ㅣ i      i        i
ㅔ ei     e        e
ㅐ ai     ae       ae
ㅟ ui     wi       wi
ㅚ oi     oe       oe
ㅡ y      ŭ        eu
ㅓ e      ŏ        eo
ㅏ a      a        a
ㅜ u      u        u
ㅗ o      o        o
ㅑ ia     ya       ya
ㅒ iai    yae      yae
ㅕ ie     yŏ       yeo
ㅖ iei    ye       ye
ㅛ io     yo       yo
ㅠ iu     yu       yu
ㅘ ua     wa       wa
ㅙ uai    wae      wae
ㅝ ue     wŏ       weo
ㅞ uei    we       we
ㅢ yi     ŭi       eui

Consonants

ㄱ k/g      k/g      g
ㄴ n        n        n
ㄷ t/d      t/d      d
ㄹ l/r/Ø/n  l/r/Ø/n  l/r/Ø/n
ㅁ m        m        m
ㅂ p/b      p/b      b
ㅅ s        s (sh)   s
ㅇ ñ/Ø      ng/Ø     ng/Ø
ㅈ ch/j     ch/j     j
ㅊ chh      ch'      ch
ㅋ kh       k'       k
ㅌ th       t'       t
ㅍ ph       p'       p
ㅎ h        h        h
ㄲ k'       kk       kk
ㄸ t'       tt       tt
ㅃ p'       pp       pp
ㅆ s'       ss       ss
ㅉ ch'      cch      cch