This is the story of the people living in the same apartment complex. Each apartment lives in other habits and individual stories play over they lives.

»Apartment number 105 - The apartment belongs to the landlord and his family. Kim Suho, the landlord himself, Kim Jongdae, his eldest son, Kim Jongin, his youngest son and his wife Yoona.

»Apartment number 205 - This apartment is owned by a woman in her early 30's, Park Dara. She works as a cosmetician. She also shares the apartment with her 8 years younger boyfriend Park Chanyeol. They have dated for two years and lived together for a year. He is a art student and lives there, saying that he rents a place with his classmate (Oh Sehun).

»Apartment number 211 - A cohabitant couple, Kim Taeyeon and Byun Baekhyun, lived here for few years already. They not plan to get married, but everyone is pushing them to commit already. He works as a barista in his neighbor's family coffee shop (Chanyeol's mother's) and she is a ballet teacher at the local elementary school. After the first 2 years of dating, they started to fall apart, living by habit, and Baekhyun tries to find a way to keep their relationship, but ends up breaking it...

»Apartment number 311 - Oh Sehun's parents bought this place for their son, to live closer to his college, where he studies art along with Chanyeol. But after Chanyeol moved to his girlfriend, Sehun stayed alone and it was financially harder for his parents to pay for the apartment. His mother gave out an offer, searching for a roommate for Sehun...