Did you want to go back to change the past in the past?If really can let you return to the past, when you are trying to change history, history of wheel inadvertently affected even the life of others, you may be just back to the past rescued a girlfriend was an accident, you change your future full of experience;You now experience everything possible is being others' changing in the past, lost in the illusion of change, be inferior to cherish the present, embrace the future.