The most common Korean word for “last night” is 어젯밤 (eojetbam). 「last night」는 한국어로 어젯밤.
Learn 어젯밤 free — flashcards, audio and review →「어젯밤」 단어장으로 무료로 외우기Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato