In late autumn of 1953, post-Korean war, the Oriental coffee house is located in a narrow alley of Myungdong. The coffee house is a shelter and hideout for artists. One late afternoon, Military Counter Intelligence Corps supervisor GiChae Kim enters the coffee house to investigate the murder of poet DuHwan Baek, a regular customer of the coffee house. The sudden death of the poet leaves the customers in shock, and the more GiChae Kim investigates, the more the customers start to suspect one another. During the investigation of the murder of DuHwan Baek, it is uncovered that YuJung Choi, the university student who is beloved by the customers, has also been murdered. This aggravates suspicion amongst customers. With no witness and no evidence, the murder of DuHwan Baek and YuJung Choi falls deeper into mystery and faces an unexpected turn of events that horrifies everyone.