Guhhh stuff like this is why I'm learning korean lol...
I use free textbook pdfs online and anki decks. I used to use apps but past learning the alphabet, most leave out SO much (duolingo was so bad with this ).Wish i could get into kdramas... Or anything with audio really, it's super good for getting used to pronunciation.
There's a huge megathread of great resources in the r/korean subreddit on reddit if you're looking for new study materials!
Sad cause i love their designs :(