A橡皮球的起伏让他们痛苦，所以暂时的失败变成了永恒。他们的勇气是否忘记告诉他们：橡皮球会暂时落下，过一段时间后会再玩，就像名利、工作和机会一样 noise is coming from the floor upstairs. Eunsu, hears this for over a month which causes uncontrollable anger to rise up. She gets eliminated again from a competition she had prepared for a long time. Eunsu decides to write her last piece with the theme of the noise between the floors and persuades her friend to help her follow and track the secret.