Zijie is a young fencer longing to reconnect with his estranged older brother Zihan, who mysteriously returns after seven years in prison for murder. Zijie believes his insistence that he is innocent and secretly decides to help him, defying their mother’s efforts to erase the criminal from their lives. In gratitude, Zihan starts to train Zijie in fencing and his improvement is immense. But Zihan’s hostile past is triggered after an argument, leaving Zijie to question whether his brother might really be a violent sociopath.