It is a world of Cultivation.You(Name) have died in that world and your soul has transmigrated to a different world. This world is different, as you try to remember your past you meet Demon's God who saved your soul. Before sending it this way to this different world while revealing your birth secret which is of a Half-Demon. He gives you your powers before parting ways.
In a different world, you have no choice but to occupy a different person's body and live his life as you.
In order for you to be able to install this game, you need to enable (allow) installation of applications from unknown sources (Unknown sources) in the phone settings. Usually this item is in the Security section