It's really well written! A fantastic horror/psychological manwha, NOT a Yaoi. I have read it twice, and both the times it gave chills up my fucking spine. It was so scary. I highly recommend.
P. S: Also, if you're young (like 10) and you copy what you see and you are naive, please don't read this one unless you are mature enough and can differentiate between fiction and reality. I promise it will be good in the long run. This one fucked me up, to be honest.
P. P. S: If you liked this manwha, try Obey Me, or Warehouse. Both are good manwha that are in similar vein as this.
Killing Stalking