Returning back to the time before Earth gained Qi

Jagan has returned to the time before the game 'Life Changer' (L.C) was released. L.C is the game created by Heavenly Dao created as a last hope for Humanity to survive on Earth which will gain Qi. In his previous life, Jagan was one of the good players, although not the best. 100 years after Earth gained Qi, the aliens attacked Earth and many people died facing the aliens. Jagan knowing all the future opportunities decided to rewrite his and humanity's fate.