well technically, it is. survival of the fittest aka natural selection means the ability of living things to adjust and adapt to different situations. if you can't adjust, you die. it works in this situation where they created new rules to survive the apocalypse. You're probably confusing the meaning as "the strongest win" which is a wrong interpretation.
@trashcan i love how you're so confident in being wrong. he was arbitrarily killed, that's not "survival of the fittest". survival of the fittest is in regards to natural selection, it's about natural death due to biological constraints (getting too weak from sickness, not being able to be hungry for too long, etc). was it not for guwon, he would still be alive and kicking. if you kill everyone in a room and you're the only person left, it doesn't mean that you were the fittest for survival.
if anything, stealing med to help his son was actually a very resilient act that showcased survival of the fittest better : he knew where to go and what to do to help his son, he was able to adapt and react accordingly and swiftly to his son getting sick.
