The Regressed Genius Player's Legendary Weapon Creation

Level 1 Magicless Alchemist, Kim Simun. On the day the Earth was destroyed, he created the Philosopher’s Stone, which could make anything possible, as long as equivalent exchange was satisfied.
“Everything is possible, you say?”
What he wants right now is to strike back at the villain who destroyed Earth and killed his younger brother, and to live a life without being magicless! He thought he had ended his life filled with nothing but regret… But when he opened his eyes, he found himself back 11 years in the past?
“This time…”
He will fix his miserable life as a magicless person, and change all the unfortunate events that are about to happen! Follow Kim Simun’s journey to change the future, with his partner, the Philosopher’s Stone!