Fast examination and an active opposition culture. Foreign brands that trend on Korean social media often get filed by a third party before they enter the market.
Korea examines quickly and expects precise claims. Design filings can be deferred or filed without examination for short-lifecycle products such as fashion and consumer electronics.
Marks are published and can be opposed in a short window before they register. Watching the register is how you catch a lookalike while it is still cheap to stop.
Register the Hangul rendering of your brand together with the Latin mark, for the same reason you would in China or Japan.
Descriptive and laudatory elements are routinely refused. The distinctive part of the mark has to carry it.
Registrations can be cancelled for non-use. Keep local sales evidence from launch.