Yura, who lost her mother at a young age, lived a happy albeit modest life with her father, who ran a subcontracting company, and her older brother, a promising young professional boxer. One day, news arrives that her brother got into a brawl with local delinquents. He had to defend himself against their unreasonable harassment. Rushing to the delinquents' hangout, Yura and her father are confronted with a demand: "If you want to protect your brother's future as a boxer, pay the settlement fee immediately, or we'll expose everything to the public!" Her father hurriedly leaves to secure the money, but Yura is left behind as a hostage...