I really enjoyed this game!!!
The music is great, really sets the tone for all the different scenes. Well done to the music composer.
Art wise, I really liked the falling rain animation, it was very pretty. I was hoping to see more animated backgrounds. The splashes of colour against the black and white art style really helps draw my attention to parts of the game. I also like the way you coloured the blood XD aesthetically pleasing.
I think I found a typo:
"as we want to open the door" do you mean "as we went to open the door"?
But otherwise the writing is very well done and I really like Sungmin's personality.
Overall, solid game. Great job and I'll be checking out Egoholic next =D