This drama centres on a building that is on the verge of collapse after a sinkhole incident. As the danger grows, four young people connected to the building in different ways begin to uncover corruption.
| Actor | Role |
|---|---|
 Jin Ji-heeNot listed | Not listed |
 Park You-naNot listed | Not listed |
 Han Hyun-minNot listed | Not listed |
 Song Geon-heeNot listed | Not listed |