The eldest son visits his mother's bedroom. He came to wake her as she was about to go out, but the mother demands "their usual relationship"—a special bond that crosses the boundary between parent and child. The two merge into one intimate space, forging a new boundary together. Meanwhile, the younger son harbors intense feelings for his mother. Though she whispers, "This is a secret from your older brother," she still accepts the younger son's passionate desires. Eventually, the eldest son discovers his mother's relationship with his younger brother. As the emotions of the three become entangled, a new drama unfolds.