a b c d e f g h i j k l m n o p q r s t u v w x y z = [에이, 비, 씨, 디, 이, 에프, 지, 에이치, 아이, 제이, 케이, 엘, 엠, 엔, 오, 피, 큐, 알, 에스, 티, 유, 브이, 더블유, 엑스, 와이, 지] Here are a list of approximate pronunciations of English alphabet in Korean. A [아] [애] [오] [에이] [어] [이] AI,AY [에이] AR [아] [어] AU,AW [오] B [ㅂ] C [ㅅ] [ㅆ] [ㅋ] CH [ㅊ] [치] CK [ㅋ] D [ㄷ] DG [ㅈ] [지] E [이] [어] [에] EE,EA [이] ER [어] EU,EW [유] F [ㅍ] G [ㄱ] [ㅈ] H [ㅎ] I [아이] [이] [어] IR [어] J [ㅈ] K [ㅋ] L [을] M [ㅁ] N [ㄴ] NG [응] O [아] [오] [우] [오우] OA [오우] OO [우] OR [어] [오] P [ㅍ] PH [ㅍ] Q [ㅋ] R [(우) + ㄹ] [어 + ㄹ] S [ㅅ] [ㅆ] [ㅈ] SH [쉬] T [ㅌ] [ㅅ] [ㅊ] TH [ㄷ] [ㅆ] U [우] [어] [유] UR [어] V [ㅂ] + [ㅎ] W [우] X [ㅆ] [ㅈ] [그즈] Y [이] [아이] Z [ㅈ]

The Hangeul characters don't directly correspond to letters in English. As Heesob Park explained, those are closest approximation. But as for 'jieut" being pronounced "j" and "ch", that depends on where it is in a syllabic block. If it comes at the end of a syllable, then it's "ch" and if at the beginning, it's "j." Although from what I've heard by listening to Korean speakers, "ch" and "j", as well as other characters with two pronunciations, are not distinguished in Korean.