I am 2 weeks into learning Korean, and still in the first module of 7, but am immensely enjoying it so far. The audio lesson is followed by 4 different "tests" that can be redone with a focus on phrases or words you did not know, as well as has those phrases and words to parse through on your own time following the lesson.
Rocket Languages essentially gives you all the tools to work at this in the way that best suits you, including the ability to turn off the Romanisation of Korean words if you would prefer to learn their writing style instead. While I find the course is very good at letting you set your own pace and approach, I do think the focus on Korean writing is a bit weak. You can access all the writing guides out of order to prioritise this, but this course focuses on speaking first, writing second. I am sure with time I will be able to do both, and this is based off of personal preference, but bear in mind that being able to read Korean phonetically before speaking it in this course may include using outside resources or taking lessons out of order.