At the beginning, the drama centers around the leads Yi Hyun, a baseball player who is forced to quit due to knee injury and Sae Bong who comes at rescue for the depressed Yi Hyun back at school. 12 years later, both of them are talented in their professions, SB as a SOU officer and YH as a detective. It was a dream of SB to have her own home. In order to get her dreams come true, she makes a deal with YH - to get married with each other in exchange of living together in the newly built apartment, and getting 40% ownership of the apartment in 10 years. YH agrees and they move in together, living their lives happily and comfortably...but the crisis begins when the women above their unit gets affected with the Mad Person Disease, and the building is put under lock down when the number of infected rises in their neighborhood.
Afterwards, story mainly focuses on the behavior of the people living inside the building. Despite an alarming situation, almost everyone acted according to fulfill their selfish desires, without using much logic. Even though the leads did their level best to prevent the the number of infected people to rise, what they received in return was betrayal. The neighbors, especially the dermatologist of 601, and Young ok, the lady who was desperate to become the apartment representative by all means. I barely saved myself from hitting the laptop screen due to their trashy personalities.
As the number of episode was limited to 12, I'm sure the directors had to edit out a lot of scenes. It would have been much better if they made it a 16 episode series. If the details how they developed the drug, distributed them and cured the infected were added, it would have been enough to eliminate the plot holes.
The overall plot and acting was very realistic. Also, I LIVED FOR THE LEADS CHEMISTRY. They were soooo good together..TT