- Director – Ahn Gil Ho
- Screenwriter – Han Sang Woon
- Genre – Thriller, Action
- No. Of Episodes – 12
- Airing Period – Nov 5, 2021 to Dec 11, 2021
- Duration – 1 hr 10 min
- Network – tvN, TVING
Set in the near future, an apartment building has been newly constructed. The residents are from diverse backgrounds, but a new infectious disease breaks out. The drama depicts the subtle psychological battle and the class discrimination that occurs.
Yoon Sae Bom is a member of a special police squad. She is decisive and has fast judgement. She is excited to move into her new apartment, but, as soon as moves there, she faces a crisis.
Jung Yi Hyun is a smart and honest detective who, for a long time, has held romantic feelings for Sae Bom. They graduated from the same high school. He struggles to protect Sae Bom and other people.
Han Tae Seok is a lieutenant colonel and belongs to the health service command. After being discharged, he worked at a pharmaceutical company. He is the perfect person for a position dealing with infectious diseases.
- Han Hyo Joo as Yoon Sae Bom
- Park Hyung Shik as Jung Yi Hyun
- Jo Woo Jin as Han Tae Seok
- Park Joo Hee as Ji Soo
- Lee Ji Ha as Jo Ji Hee
- Baek Hyun Jin as Oh Joo Hyung