In the End of the World, I Have a Clone in Fantasy

Born in a post-apocalyptic world, one day I had a golden finger, a clone in a fantasy world. The apocalyptic world is a martial arts world, and my strength is too weak. It doesn't matter, I have a clone in the fantasy world. Although I am a novice in the apocalyptic world, it doesn't matter, I have a very strong clone. Of course, it is difficult to transfer the ability of the clone to Doomsday himself, and it requires a certain amount of energy. This energy protagonist discovered that as long as he collected the lost crystals in his brain, he could provide energy for power transformation. From now on, the protagonist no longer has to live in the apocalypse, but instead eats watermelon, embraces a girl, and enjoys the life of a winner in the apocalypse. After all, strength is truth.