Cheolsu Saves the World

When the massive asteroid Rama annihilates Earth, ordinary office worker Cheolsu Kang is miraculously sent back in time to his middle school days. Armed with the terrifying knowledge of the impending apocalypse, he must dedicate his new life to advancing science and technology to intercept the threat. This gripping sci-fi drama eschews fantasy tropes for grounded problem-solving, challenging one man to unite humanity against extinction. Can Cheolsu alter the timeline using only his intellect and determination, or is the world destined to end?