Ria is a married woman living in a two-family household with her husband's parents. One day, her brother-in-law, who had fallen victim to marriage fraud and was burdened with a large amount of debt, returned home temporarily. Having lost everything in both his work and private life, the brother-in-law noticed the sounds of the younger brother and his wife's nighttime activities one night, and began to feel restless and conflicted about his sister-in-law. In the sweltering summer heat, Ria's sweaty body looked dazzling, and the brother-in-law lost his reason...
