This is totally unrelated to this episode, but this is my assume plot about sahyeong, the pink hair dude and dal guk's hyung... I don't know if the author think other wise but for me, I think the girl we saw at the first episode of season 3 is related to the boy who was with guk's brother, the white hair guy with the blue eyes or not. At some point I think sahyeong and guk's brother will meet at the middle of the season 3 or at the end of the season 3 or not... But, I wish, I wish them to end up together... I know this is ridiculous but still... I'm praying... they will look so good together... 
I haven't read killing stalking cuz I'm too broke to paid for my therapy.. 