Four couples cohabit in the same building, each occupying their own apartment. The first couple, in their thirties, have been living together for five years without tying the knot. The second couple consists of a 33-year-old woman and a 21-year-old man who's neither studying nor working, relying on his girlfriend's support. They've been living together for a year, unmarried. The third pair isn't a traditional couple; a man seeking a roommate ends up sharing his space with a Japanese traveler passing through for two months. Their bond deepens beyond friendship. The fourth couple, together for three months, plans to marry and live together with their families' blessing.
