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I don’t think it really counts, because the event in the series was already quite harsh. It was even worse than what happened in the real incident.
Also, when the series was made everyone already knew about the dangers of aircraft accidents. Is not like the real-life event suddenly caused everyone to realize that ”this is not just something that happens on TV, and ot can be dangerous”. That was already known.
So it’s not really made harsher and the ”hindsight” part isn’t there either.
For reference there is Hindsight clean up
thread that can be consulted for these questions.

Hey guys. As you know on May this year there was a really unfortunate incident involving the South Korean airlines Asiana: Some man stupidly opened the emergency door BEFORE LANDING and it caused a massive chaos, anxiety and trauma for both passengers and staff involved.
And in the series Vagabond (2019) something similar had happened where the main villains caused an internal damage to the flight Cha Dal Geon's nephew was in which caused his and the passengers' death, including most holes being open in the flight and causing suffocation and air compression. What even hits the correlation TOO close to home is that the group of passengers in Asiana were a high school athlete team, much like the deceased Taekwondo school team. Luckily unlike what happens in the series, EVERYONE survived the incident, albeit with some injuries and a lot of Aerophobia.
But still what I want to ask is, do u think this incident would count as a Harsher in Hindsight YMMV trope for Vagabond?