The Omniscient Reader manhwa is quite faithful. It does a good job of presenting the plot and characters as they were in the original. Some minor details might be tweaked for better visual or narrative flow, but the core remains intact.
Definitely not. Manhwa comes from Korea. It has unique features that set it apart from Chinese comic works in terms of art style, storylines, and cultural influences.
Sure is. Manhwa specifically refers to comics created in Korea and has its own unique style and characteristics compared to comics from other countries.