Two neighbors, Taehyung and Seokjin, constantly argue about various things, like misdelivered packages or Taehyung's noisy sexual shenanigans that keep Seokjin from getting any sleep. However, everything changes when Seokjin has a rough day at work and breaks down in front of Taehyung. In that moment, Taehyung sees Seokjin up close, and his heart skips a beat. From that point on, their relationship changes from neighbors who can't stand each other to lovers who can't live without each other.
After spending ten years as a couple and tying the knot, Taehyung reaches his breaking point and can no longer tolerate Jin's way of living. On the very day, they have a heated argument, and Seokjin discovers that he's expecting, but in a manner that nobody could have ever anticipated.