Not official, just the fans trying to compare the locations used in the recently revealed OP out of interest. Japanese animation artists usually use real locations for their shows and so the Koreans who are using their art style follows suit.

I recognised Paris in France and Shibuya in Japan but didn't notice Melody in Hong Kong!

One little mistake, though. The tower to the far right isn't the "International Finance Centre". It's the Bank of China tower which is 367m tall. Picture must have been taken from Tsim Sha Tsui, a popular tourist destination where you can see beautiful night views of Victoria Harbour opposite.

EL is also supposedly singing in the Sangam World Cup Stadium in Seoul, Korea which was constructed for the FIFA 2002 World Cup.

Source:
• Ruliweb

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