One keyboard, two halves
The standard Korean layout is called 두벌식 (dubeolsik, “two-set”) because it splits the letters into two sets. Every consonant sits under your left hand, every vowel under your right hand. Since a Korean syllable almost always goes consonant → vowel → (consonant), your hands simply take turns: left, right, left, right. That rhythm is why fluent Korean typists are so fast.