http://www.lezhin.com/ko/comic/serenade
http://www.lezhin.com/ko/comic/moon

Korea is developing some surprising stuff lately. Nice.

In my opinion, "Faith" is one of the best Korean series ever aired.
I love Korean series. After Jumong series aired in Iran, Korean series have gained a lot of fans in Iran.
For reviews of best korean series so far you can visit Plaza Magazine (plaza.ir/mag)