Lessons

How Hangul packs letters into squares — plus 6 consonants and 6 vowels. Read 서울 and 강남 by the end.

ㄷ ㅂ ㅈ ㅎ — four known shapes plus one stroke. Unlocks the whole address ladder, 부산 (Busan) and 한국 (Korea).

ㅋ ㅌ ㅍ ㅊ and the doubled ㄲ ㄸ ㅃ ㅆ ㅉ — the extra stroke and the twin shapes both follow one rule. Completes all 19 consonants.

Y-vowels, the ㅐ/ㅔ pair that sound identical, and the W-combos — three rules, and the alphabet closes at 40 letters.

Why 27 different bottoms of a block make only 7 sounds — and the six rules that make 종로 come out as "Jongno". No new letters.