Mystic Pop-up Bar tells the story of a mysterious pop-up bar run by an ill-tempered woman named Wol Joo (Hwang Jung-eum), an innocent part-time employee named Han Kang-bae (Yook Sung-jae), and a former afterlife detective known as Chief Gwi (Choi Won-young) who visit customers in their dreams to help resolve their problems. This mysterious pop-up bar opens only at night and the customers who visit this pop-up bar consist of normal people and the dead. While drinking alcohol and eating dishes with Wol Joo, the customers talk about themselves and try to heal their internal wounds.