An unusual social investigation opens the mysterious door to an unknown maze…I’ am a graduate student researching ‘intangible folk cultural heritage’ and have undergone an incredible social investigation with my mentor, Kang Jin. A rural woman claiming to be from the Orion Arm; a mysterious old carpenter who created a wooden puppet of his cancer-stricken son; a mysterious creature called ‘water monkey’ that appears in the Yellow River; a deceased person who engaged in a firefight with the police during a ‘gold store robbery’…All kinds of mysterious events emerge in an endless stream, with vague connections between them. All clues point to a mysterious organization called ‘Tongmen Society’. As the investigation gradually deepens, a huge conspiracy gradually surfaces…