How do you learn Korean fast? Or relearn a language you forgot?

1) If you have the time and resources, the best way to learn Korean fast is through complete immersion in Korean culture. Take a trip to Korea, and you'll be challenged to speak and read in Korean at every turn. Although many Koreans will be able to speak to you in English, commit to only speaking in Korean. 2) The better news is that with the right methodology, it's possible to relearn a language you've forgotten in 21 days or less. Psychologists have also stated that even after years without using the foreign language, it's possible to learn a language again once you've forgotten it.

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hope this helps you :)