SPOILER:
Its really an interesting ending. I was expecting with hyunsung falling in love with the stalker (which, i don't know if his attachment can be called love) but i was very surprised when the stalker actually showed genuine negative emotion when hyunsung was going to move. So, technically the stalker kinda had karma? At the end he is the one who can't live without hyunsung and got attached.
This is very dark but a good read. i got the two stalkers mixed up alot lmao, its hard to differentiate between the two. But the whole plot is good and makes you just want to keep reading.
Stalker's Game