Disaster films have always shown an extreme environment, where everyone is at risk. Faced with the choice of human nature, should you choose righteousness and try your best to help more people escape to heaven, or choose to protect yourself at the cost of other people's lives? This is the highlight of human nature revealed by the trip to Busan.
From the very beginning, the zombie dog set the tone for the whole story. A train bound for Busan killed countless people. Since it is to expose human nature, there must be good and evil. The uncle who has always protected his pregnant wife, the student who has always protected his teammates and the girl he loves, and of course Uncle Gong Yoo's father. These three men make up the best part, protecting those who should be protected.
One of the evils of human nature is the train conductor, who sacrificed many people who should not have died in order to protect himself. Another is that Gong Yoo and his party risked great danger to escape from the car full of zombies but were not accepted by the safety car. The reason is also very simple, escape from that kind of place, who knows if you have been bitten, and gave up trusting others for the safety of a carload of people.
In the end, the positive characters chose their own ways of dealing in order not to hurt others, leaving pregnant women and weak children. The most powerful people die to protect their loved ones, and the selfish ones don't end well either. It's not absolute, but it's unintentionally a tragic reunion in the film.
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