im actually here to sneak a look at the answers LOL i kind of swapped to watching my shows off chinese sites because the subs come much faster and much more accurate, but there are some shows that are not subbed so i have to source for english subs XD
I do remember watching Hwarang on dramacool because the subs came out the fastest, I'm not sure if they're still about with their game?

I use Viki, but I'm still catching up on older shows so speed of subs doesn't matter as much to me.

Ondramanice.
Though i'm currently using Viki

dramago.com

Quickdrama.com and kissasian.sh are the go to sites for me