I want to learn Korean so i can learn to translate manhwa,
Ok well you kind of answered your own query. Indeed you have to learn a language, at least a reasonable amount of it before you can expect to be able to translate it, that much is certainly true.
There is no magic method that requires little or no effort on your part when it comes to learning a foreign language. You have come to the right place if you want to learn Korean -- start with the level here that is appropriate to your skill level and then study and practice to reach your goal.
Personal note: I bet you loose interest in manhwa before you master enough Korean to effectively translate it. Please prove me wrong.