A horror webtoon writer journeys to a shabby apartment building in search of ideas. The building's caretaker tells him about multiple strange events that happened throughout the building's history.
| Actor | Role |
|---|---|
 Sung JoonJi-woo | Ji-woo |
 Kim Hong-paKeeper | Keeper |
 Kim Bo-raDa-hye | Da-hye |
 Lee Chang-hoonWriter | Writer |
 Park So-jinPharmacist | Pharmacist |
 Lee Dong-haHo-jun | Ho-jun |
| LLee Gwan-mokDetective Ma | Detective Ma |
 Park Se-hyunHigh School Girl | High School Girl |
| JJoseph KimEnglish Instructor | English Instructor |
 Shin Yoon-seopMusician | Musician |
 Cho Soo-hyangBallerina | Ballerina |
 Lee Seung-wonProducer | Producer |
 Seo Hyun-wooBroker | Broker |
 Park Kyoung-bokReal Estate Agent | Real Estate Agent |
 Ji Nam-hyukRepairman | Repairman |
 Kang You-seokInternational Student | International Student |
 Lee Suk-hyeongMold Youth | Mold Youth |
 Won Hyun-junDelivery Man | Delivery Man |
 Kim Jae-hwaHigh School Girl's Mother | High School Girl's Mother |
 Hyun Bong-sikDetective Park | Detective Park |
 Baek Min-hyunEditor-in-Chief | Editor-in-Chief |
 Lee Do-eunMin-ji | Min-ji |