hˈaɪ skˈuːl stˈuːdənt mˈuːn bˈɪn kˈɪm hɐz dˈɪfɪkˌʌlti slˈiːpɪŋ dˈuː tʊ ɐ ɹᵻkˈɜːɹɪŋ nˈaɪtmɛɹ wˌɛɹ hiːz stɹˈændᵻd ˌoʊvɚɹ ɐ θˈaʊzənd jˈɪɹz ɪnðə pˈæst tʃˈeɪsɪŋ ɐ dˈɑːɹkhˈɛɹd ɡˈɜːl ˌɪntʊ ɐ dˈiːp ɐbˈɪs.
High school student Moon Bin Kim has difficulty sleeping due to a recurring nightmare where he's stranded over a thousand years in the past chasing a dark-haired girl into a deep abyss.