The first time you step into a bustling Seoul subway station, the air hums with energy—neon signs flicker in Hangul, the scent of *tteokbokki* mingles with the metallic tang of the tracks, and strangers move in synchronized waves, their voices a melody of polite exchanges. Amidst the chaos, one phrase stands out: “안녕하세요” (Annyeonghaseyo). It’s […]