This manhwa is a psychological train wreck- you can't look away.
The story itself is interesting and unconvential but well written, so it makes for a valuable read. The characters undergo very real physical and mental struggles and the artist creates suspense flawlessly. Explicit. Heart-breaking. Realistic-style artwork and gore.
As a word of warning, do not start reading this web comic if you need to love a character or their relationship and please realize that what is depicted is unheathly at the very least.