A woman widowed at a young age runs away from home with her daughter, though leaving her son at home. The brother and sister grow up and become lovers without knowing that they are from the same parents. The woman implores her son to leave her daughter. He, who does not know she is his mother, aggressively defies her. She commits a manslaughter embroiled in a brawl as she tries to stop the man's commotion. She goes on a trial for the man's death and the secret breaks out.