Kyungsoo was mentally ill. He could be a sweetheart at one point, and a satan at another. His doctor, however, was able to somewhat change him, and that was when he fell for the doctor, but when this doctor stopped coming to care for him, Kyungsoo goes on a rampage and kills his way to find his doctor, whom he had grown addicted to. He wanted his drug, the only thing that had kept him calm was his doctor, Kim Jongin.

If there was a someone I would never wish to forget, it would be him.