Most efficient way to learn Korean?

I've been saying I would start learning Korean for a while now mainly in order to understand lyrics and watch Kdramas without subs and also just because It's quite different from basic English in terms of letters etc. But I find myself often going back to French and Spanish since I already know quite a bit from GCSE so it's not as difficult to pick up when I left off.

Since Korean isn't available on Duolingo I was wondering if there's any other recommended resources to learn the language? I've looked at TalkToMeInKorean and How To Study Korean but the way that certain things were introduced just kind of threw me off a bit. I was also curious about motivation tips to stay interested, unlike before I don't have the threat of failing an exam if I can't pick up the language so I've been working at an agonisingly slow pace.