did u read killing stalker....?

well it's 2-3 yr ago I just read ch. 10 It's became worse so I dropped but I still curious what happened in story because it's famous manhwa so the things I want to know is
# sangwoo is good or bad..?
# why he killing people..?
# which kind of ppl he killed..?
# did he(sangwoo) die in the end..?
# is Yang Seungbae a good person..?
# dose Yang Seungbae die in end...?
# ending is happy or said..?
# dose Yoon Bum get wt he deserved..?