A new type of deadly virus spread throughout the city, and the apartment where has different social classes of people is sealed off. With the fear of the virus, and the conflicts of the different classes, the residents have to spend and survive in the new habitation.

A psychological thriller that delves into the reality of power. It follows the story of three men and women whose lives are destroyed by a tragic accident as they become a team that uncovers corruption and fights against people with power.

Da Il, a ghost detective, meets a mysterious woman named Woo Hye and gets drawn into a strange case.

seg.1) Jong-soo misses his roomate Yeong-joo, who is gone. He's embarassed he misses someone who wasn't even his lover, but a close roomate. Meanwhile, Yeong-joo knew this day would come. seg.2) Min-ha is full of vitality. Ki-cheol lives in the greenhouse built by her. They've lived together for almost three years. One day Ji-hye bumps in between them. seg.3) Lovers Yoon and Cheol decide to spend a day up in the mountains. However, Yoon suddenly pours her heart out on all the things she was upset about at Cheol. seg.4) Sang-won is working at an electronics department and having a secret relationship with an elderly woman who is from the store across. As spring approaches Sang-won starts to feel weak. seg.5) One warm afternoon, Min-jae the chef was taking a nap and Ji-hong woke him up. seg.6) Byeong-goo, a former boxer has been caught in a punch-drunk. Byeong-Gu realizes he doesn't have much time life and starts boxing again.