Fifteenth letter: ㅜ is for rOOt because it's like a small little root underneath the horizontal. Like the oo in nOOna (누나) or if you know Spanish the u in Uva or the oo in fOOd. The verb for crying (울다) and the verb for smiling/laughing (웃다) both have this vowel.
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Learn Korean in 30 Minutes
Non-FictionAll Hangeul letters WITH MNEMONICS TO MAKE YOU MEMORIZE INSTANTLY!!! Plus explanation on pronounciations