Please answer the following question: I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Peaceful Warrior Movie plot: Dan Millman is a university student as well as a locally famous gymnast who dreams of winning a National Championship competition. He suffers from restlessness, and on one occasion Dan attempts to compensate for the restlessness by running along streets before sunrise. At a car-service station, he encounters an old man who seems to know more about Dan's problem than Dan himself knows, whom Dan later nicknames "Socrates". Dan is unsettled by Socrates' knowledge; by the fact that Socrates had appeared in a nightmare as a faceless janitor, clad in mismatched shoes (by which he is identified in waking life), who sweeps up the pieces of Dan's shattered leg; and by the old man's extraordinary speed, agility, and coordination. As a result of his exposure to the last, Dan seeks to learn the secret behind it. Socrates, prodded by the impatient and defiant Dan, gives the boy a series of tasks and lessons. The central concept of "Soc's" philosophy is this: that one must live entirely in the present moment. Other ideas include the related notion that at no time is "nothing going on" and the idea that an appropriate time exists for fighting and another for abstaining from violence. These lessons are conveyed through practical lessons, long contemplation, and one spectacular mystical experience. Dan gradually learns to appreciate every moment; to view the journey toward a goal as more meaningful and significant than the attainment; to pay attention to that which he is doing thus increasing his gymnastic prowess; and (to a slightly lesser extent) control himself. Throughout the lesson, Dan learns virtually nothing about his mentor, other than the philosophy, Socrates' belief that service is the most noble action possible (hence his choice to work as a car serviceman), and the presence of another protege. This protege, a woman of Dan's own age named Joy, has learned and integrated Socrates' philosophy into her life, to the extent that she seems as wise as Socrates himself. Dan attempts to ask her for information... My question: Who changes Dan's life?
A:
Socrates