The Door World Arrives, and I Seek a Way to Survive

[One male lead, satisfying, but not overpowered from the start, plot-driven, urban supernatural powers] One day, enormous gates suddenly fell from the sky. No one knew where they came from, and no one could move them even an inch. Then an unknown voice appeared in people's minds, and a countdown appeared before their eyes. The challenges to enter the gates began, and the worlds beyond them descended. Survive in these worlds and complete the tasks assigned by the System to clear each stage, and you will receive all kinds of rewards. At the same time, strange changes began to emerge in the real world...