The fictitious Seoul neighbourhood depicted in the hit South Korean film Parasite has plenty in common with the city’s real Changsin neighbourhood, where, just like in the movie, the narrow streets are lined with dilapidated commercial and residential buildings.Changsin is a world away from the ritz of Gangnam in the city’s south, and is one of the capital’s poorer areas.Parasite, which this week became the first South Korean movie to win a Golden Globe award for best foreign language film, is…