一九六九年六月,人们在安徽省亳州市挖掘防空洞时,一条神秘的古地道突然出现在大家的面前。这条地道砖砌工整,没有尽头,好似一座地下谜城,由于是曹操的故里,亳州市的人们祖祖辈辈对曹操充满了敬畏。这条地道会不会与曹操有关呢?。After two mysterious deaths at a college on the same night, seven students, somehow connected, receive invitations to a confessional booth hidden on the campus. Their confessions slowly unveil the truth behind, not only the deaths, the booth as well. The dark, twisty, dialogue-driven and emotionally-complex mystery is entirely confined to the video confessional.。