Hiding Out in an Apocalypse

21st Century Adult Protagonist American/s Apocalypse Based on a Novel Black-Haired Male Lead Black-Haired Protagonist Blood and Gore Calm Male Lead Calm Protagonist Clever Male Lead Clever Protagonist Foreigner/s Full Color Kill or Be Killed Situation Male Protagonist Mass Murder/s Massacre Modern Era Monster/s Murderer/s Mutant/s Observant Male Lead Observant Protagonist Post-Apocalyptic Ruthless Male Lead Ruthless Protagonist South Korea Survival Survival of the Fittest Survivor/s War/s Weapon/s Webtoon Zombie/s