Couple Su-ji and Sang-min, who once lived next door, and Su-yeon who experienced having an affair, spends a moment of confusion due to Su-ji's sudden death, and now lives a normal life with her husband Dong-seok.
Then one day, Dong-seok gets into a parking dispute with Mi-ran, a newly-married couple who moved next door, and Su-yeon is embarrassed to learn that Mi-ran is the female junior who once had lesbian tendencies towards her in college.
Two couples living next door and getting close.
Unlike before, Mi-ran has become a lawyer and ignores Su-yeon. Su-yeon gets angry. Meanwhile, Su-yeon found out that Mi-ran's husband, Seok-ho, is a stay at home husband, and Su-yeon who is in the same situation is attracted to him.