Geo-Ul, a late-30's unemployeed woman with a penchant for meddling in other people's business, lives with her younger brother Duon and takes care of his nephews. Forced to leave Duon's house, Geo-Ul finds herself in a bind. With nowhere else to go, she moves into the "Baek-Sae Apartment" in search of a cheap room. She found that this apartment is plagued by an unsolved mystery: floor noise. Geo-Ul, the ultimate busybody, confidently steps forward to solve this mystery. However, things take a wrong turn at a crucial moment. Briefly filled with regret, Geo-Ul soon reverts to her usual self and delves deeper into the reality of Baek-Sae Apartment. Can Geo-Ul solve the mystery surrounding the floor noise and become a hero to the Baek-Sae Apartment residents who suffer every dawn?