Jae-Young and Da-Jin have been going out for 6 years. Living next door, their sex is not so hot as before but they know everything about each other. Da-Jin doesn’t mind to let Jae-Young buy a tampon for her. Jae-Young visits Da-Jin’s mother from time to time to repair the house or just to say hello. One day, a fresh young girl approaches to Jae-Young while Da-Jin encounters a charming man through work that she shares a lot in common with herself. When these new people bring fresh air to their lives, their long love relationship starts to shake down.