In a place called Mangwon-dong, a neighborhood of the Mapo-gu district in Seoul, South Korea;

Two (2) groups consist of seven (7) members each with different personalities stayed together in a one (1) building.

They would either exercise together, practice together, or go out together

And could possibly love each other?

They have started as strangers, developed as family, and adapted every change in their life.

Thus, the story goes on.