안녕히
annyeonghi · TOPIK 1
safely, in peace (used in farewells)
🕊️ 安寧 = peace + calm, plus 히 (-ly): peacefully
Same root as 안녕 (hello): hanja 安 (peace) + 寧 (calm). The ending 히 turns it into an adverb, like -ly. So 안녕히 가세요 is literally go peacefully, and 안녕히 계세요 is stay peacefully.