Ten years have passed since the death of their father in one family. Living together were a mother, her eldest son, and her youngest son. One day, the younger brother catches his mother and older brother secretly meeting. The atmosphere is strange, and the mother's loose, sensual movements deeply stir the younger brother's emotions. Shaken by the encounter, he soon finds himself drawn into a hidden relationship with his own mother. As feelings beyond the boundaries of normal family life entwine, a new and intense drama unfolds.