Cast: Jung Yu-mi, Jung Yu-mi, Jung Yu-mi, Jung Yu-mi, Jung Kyung-ho
In one neighborhood in Seoul, about 10 people disappeared without a trace over 6 months. As even the smallest clues remain as to where the missing people have gone and who took them, residents' anxiety grows. Meanwhile, unidentifiable hair and blood stains were found on the manhole cover! What on earth is happening inside the manhole that threatens our peaceful daily life?
