Thud! Thud! Thud!  The noise between rooms 401 and 501 has started!  Eun Soo, an aspiring writer who is no different from a jobless person, begins to observe the owner of the house upstairs, questioning the noise between the floors that tormented her while searching for a subject for a contest.  Ho Kyung, the man upstairs, also began to notice the existence of Eun Soo and eventually, Eun Soo faces a shocking truth...  The noise that started today  "Is the story that I only imagined real?’"