15-year-old Choi Eun Mo falls in love with her teacher Joong Shik, a mysterious new man in the town of Paju. Her feelings for Joong Shik changes when she learns that Joong Shik is dating her older sister Eun Soo. A year later, Joong Shik and Eun Soo are now married, with Eun Mo living with them.
One day, when Joong Shik and Eun Soo are home alone, a sudden gas explosion causes the death of Eun Soo. When Joong Shik tells Eun Mo the tragic news about her older sister, he tells her that her older sister died in a hit-and-run accident. Joong Shik and Eun Mo now live together.
A few years later, Eun Mo, still caught in a whirlwind of emotions for Joong Shik, suddenly leaves for India.
Upon her return to the town of Paju, Eun Mo discovers her apartment is facing demolition and the apartment tenants turned squatters are fighting desperately against the gangster muscle men leading the demolition. The anti-demolition group is led by Eun Mo's former brother-in-law Joong Shik. During this time, Eun Mo digs further into the death of her older sister and she becomes torn between the truth and her feelings for Joong Shik.