Yes, there are. Project Gutenberg is a great free option. It has thousands of classic novels that are in the public domain. You can easily download and read them on your device.
One option could be Wattpad. It has a vast collection of novels in various genres, from romance to mystery. Another is Goodreads. Although it's mainly a review and recommendation site, it can also lead you to places where you can read novels. Also, Project Gutenberg offers many classic novels for free.
Kakao manhwas tend to have frequent updates and interaction with readers. They might have elements of interactivity or special features available through the Kakao platform. The characters are often developed in an appealing way to draw in the viewers.