I'll second The Good Place! It's very quirky and always makes you feel a little better about humanity. Not one you'd have to pay 100% attention to either, I usually watch while working on crochet or something.
I don't know if you've ever tried them but Korean Dramas are really dramatic and are pretty much just like 18-20 hour movies broken up for TV purposes. You get to really know the characters. There are English subtitles as well (thats how I watch them).
If you want to start with something sci-fi-y and dramatic I'd say "Legend of the Blue Sea" - it's one of my favorites. About reincarnation, mermaids, and a group of con thieves. Oh and has some murder as well xD
Another one is "Descendants of the Sun" which is a war drama, that I also love :D