Han Sang-un

A deadly new strain of a virus is spreading throughout the city. An apartment building that is home to people from different classes remains in quarantine. Its residents must survive in their new habitat fearing both the virus and the potential conflicts between disparate social groups.

After six failed relationships Eun Jin is determined to succeed with her clumsy unromantic boyfriend, but questions arise when she suspects that he is hiding something.

Jae-Hun (Son Hyun-Joo) is separated from his wife and two daughters. He struggles to make ends meet, while working as a grocery deliveryman. Seung-Hyeon (Yu Geon) works with Jae-Hun delivering groceries. Although he is only in his 20's, he also struggles to make ends meet. One day, while Jae-Hun and Seung-Hyeon make a delivery, they notice a famous baseball pitcher (Kim Kwang-Hyun) at the apartment of a young woman. The famous pitcher is married to a woman several years older than him. A few days later, Seung-Hyeon comes up with a plan that could make him and Jae-Hun a lot of money.