Cheolsu Saves the World

Reading Cheolsu Saves the World manhwa, Cheolsu Saves the World manga with alternative name: Looking for the Evacuation / Regression of Cheolsu / 철수를 구하시오 with Description: A massive asteroid is about to hit earth! Humanity has failed to stop a giant asteroid from plummeting into Earth, and life as we know it has ended. An ordinary Korean office worker named Cheolsu is somehow given the chance to go back in time and prevent this catastrophe from ever happening. Does he have a chance?