Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.
I personally tried a lot of services and duolingo was not the best option. I advise you to go through https://preply.com/en/online/korean-tutors. When I was learning Korean, I decided to look for good tutors and therefore turned to the preply website for help. This is a very good service for finding specialist teachers.
You should try out for Duolingo. Its quite interactive and the step by step process which Duolingo follows is good.
https://play.google.com/store/apps/details?id=com.duolingo&hl=en