Drug Devourer

A gate suddenly opens in the sky, bringing monsters into the human world and allowing immortals to interfere directly with ordinary society. Han Yul is one of the people who awaken in the chaos, but his ability works in a way nobody expects: substances that would normally count as medicine, supplements or stimulants affect him like supernatural elixirs. Coffee sharpens his senses and reflexes, other compounds can produce different boosts, and the better he understands what he consumes, the more effectively he can turn everyday chemistry into combat power. As monster attacks and immortal factions reshape the world, Han Yul survives by experimenting with what his body can absorb and discovering just how far his unusual constitution can be pushed.