Iller, the real world version of Yami, his alter ego. He killed his girlfriend and you saw. Basically, Iller and his lover Naomi was having a fight on how Naomi apparently cheated on Iller. Iller was blinded by anger and killed her by pushing her down a flight of stairs. You saw and helped him, you covered it up as a suicide (drowning). He stays In his house for 2 years, he finally comes out. Everyday he didn't come out you would knock on his door. Finally today, he came out. "Oh hi.."