I Have Designed the System Myself. If I Am Not Happy, Who Will Be Happy?

In reality, Lin Feng is a frustrated young man who failed to pass the college entrance examination. His family does not understand him, and no one at school cares about him. He doesn't want to do anything anymore, just lie down, this world is too boring. But one day, he actually obtained the system. What else could he say? He traveled to a world where he could become an immortal. I want to be number one in the world, it's cool! Traveling to the past, I have to change the past, so cool!