A mysterious sound emanates from the upper floor. Eunsu has been tormented by this noise for an entire month, causing her anger to reach uncontrollable levels. To make matters worse, she is once again disqualified from a competition she had diligently prepared for. Determined to uncover the truth behind the enigmatic noise, Eunsu decides to craft her final masterpiece centered around the very theme of the elusive disturbance between the floors. Enlisting the help of her trusted friend, they embark on a journey to follow and trace this hidden secret.