I began reading this manhwa when it was first being scanlated and I have to agree with the rest of the comments that it does make a huge change after the first few chapters, and I have to say that I still love XO Sisters! I believe that readers find it misleading because of the summary. If somebody was to change the summary so that it would not be so misleading, then people would not be confused.
Nonetheless, this manhwa is still very damn good. The art is just fucking superb. Due to the HQ scans, we can really appreciate the art. It is not the most detailed art, but the art is just plain amazing. This manhwa's plot is also very well done, unlike many other supernatural-monster-hunting squad mangas/manhwas. The main protagonist does not have a harem(yet?) and is not strong yet, but in chapter 11,
Chul Hee was able to blast the extremely strong patient when he was scared for his life, it didn't kill the patient, but it weakened it SEVERLY. What sucks whas that he didn't even know he did that.
and also, in chapter 12
Chul Hee was told that he had extreme potential, but it is just dormant.
What made me sorta sad was that
Chul Hee cut his hair, I liked it when he had long hair.
Anyways, I recommend this Manhwa to anybody who likes supernatural themes, a good plot, amazingly well drawn females, and a main character who is not a typical shounen lead(weak/ indecisive/ugly/short/no physique).