Dong-sik, a music department teacher at a textile factory , expresses great interest in a murder in Gimcheon. One day, Dong-sik received a love letter from a female worker, Guo Sun-young, and reported to the housekeeper that Sun-young was fired from the factory. Cho Kyung-hee, a friend who had encouraged Sun-young to write a letter, took advantage of the opportunity of piano tutoring to start visiting Dong-sik's house. In order to supplement the family, Dong Shi's wife has done a lot of tailoring work, and her body is getting weaker and weaker. Dong-sik entrusts Kyung-hee to find a suitable Hanyo to help with the housekeeping. When his wife was pregnant and returned to her parents' home, Kyung Hee took the opportunity to express her love to Dong Shi, but was humiliated and kicked out. All this was seen by Hanyo outside the window. Hanyo took the opportunity to seduce Dong-sik and had a physical relationship with him. Three months later, Hanyo became pregnant. Knowing the truth, Dong-sik's wife pushes Hanyo down the stairs, causing a miscarriage. Hanyo, who lost his child, was furious, and his temperament became violent. As a result, Hanyo pushed the Dong-sik couple's children down the stairs and hid them. Hanyo threatened to expose all the facts to the factory. In order to save the whole family, Dong-sik gave Hanyo the room on the second floor. In the end, Dong-sik, who was going to commit suicide by taking rat poison with Hanyo, saw Hanyo dead on the steps, and resolutely abandoned her and returned to his wife. At this time, the movie screen returned to Dong-sik and his wife watching the news about the murder. Dong-sik couldn't help but say: This kind of thing could happen to anyone.