If you read the credit pages they already explained that they'll be keeping the Korean honorifics:
http://www.mangago.me/read-manga/akai_ringo_no_nakami_jijou/uu/akai_ringo_no_nakami_jijou-chapter-1/3/
Tabichan haven't read it, it Seema ╮( ̄▽ ̄)╭
It seems
Auto corrected there ( ̄へ ̄)
Ahjuma? Ajusshi? I thought they're JAPANESE ( ̄へ ̄)
The translator watch to much kdrama it seems ╮( ̄▽ ̄)╭