Everything in Yeonwoo's life is fine. He has a great job as an Elementary school teacher and a loving boyfriend. He doesn't have much to complain about... except for the fact that he has the noisiest neighbor ever! Fed up with the awkward noises coming from across the wall, Yeonwoo tries his best to block them out, but to no avail. And if that wasn't enough, Yeonwoo discovers that his boyfriend might have someone else in his life, leaving him hopeless and heartbroken. However, help arrives from an unexpected source - his eccentric and somewhat perverted neighbor. Yeonwoo begins to think that his neighbor might not be as bad as he initially thought, but everything about the bizarre man next door remains a mystery. Could he be hiding something dangerous from Yeonwoo?