I loved Train to Busan too. Hoping to catch Parasite, now that it is released in the theatres now. There are some great TV Shows but maybe not to your liking, as they are from the romance genre :P

You can try Viki.com - A site that streams asian movies and shows, including Korean. The ads are a little annoying but i remember taking a one month membership for around 65Rs that will remove these ads.