I personally really liked this, likely would not reread it though; it impacts more when reading for the first time. It is a great thriller / emotional roller coaster; the supposed romance was twisted very well, I loved the thrill and personally thought that the ending was very befitting for such a story. For me though, I never really saw the appeal of the psychiatrist, I understood he was an old flame that never truly died but I could not understand why the main character still held such strong feelings for him when he clearly moved on in a sense. But nevertheless, he was a character that helped move along the plotline despite being the most static character in the whole manhwa imo.
Interview with a Murderer