Doomsday Behind Bars

It tells the story of graphic designer Chen Mo who was imprisoned in a detention center due to a misunderstanding (he mistakenly took someone else's cell phone and was convicted of burglary), but it coincided with the outbreak of the apocalypse and the rampant mutants. He was originally ordinary, but in a desperate situation, he accidentally discovered that killing mutants could obtain "energy beads". After swallowing them, he could significantly strengthen his physical fitness - from barely protecting himself at first, to gradually gaining the strength to tear apart iron bars and kill mutants with one punch.