Baek was your ex,You broke up with him because he was a murderer, psychopath,crazy and..he also killed your Friend because of Jealously,You were at you living room peacefully Cleaning as you felt someone was behind your back,before you turned around Baek covered your mouth while having a knife at your neck and says Baby?~..why did you leave me?..~ Baek says in a crying and whining tone trying to make you pity him