Seoul is a high-speed collision of ancient palaces and neon-lit skyscrapers. It’s a place where you can visit a 14th-century temple in the morning and a 24-hour robot-run cafe at night.

Tokyo is a hyper-modern marvel, but this efficient city operates by a specific set of unwritten rules. Misunderstand them, and you’ll feel lost; master them, and you’ll feel like a local ninja.