Yoon Shi Yoon, Jung In Sun, Park Sung Hoon, director Lee Jong Jae, and writer Ryu Yong Jae attended the press conference for the "Psychopath Diary" on November 13.

Yoon Shi Yoon was asked on how he prepared for the role and he said that a lot of actors had portrayed psychopaths in the past, so he has been watching their movies and thought he can pick up something from them.

He was also asked about working with the actor who portrays the real psychopath named Park Sung Hoon. Yoon Shi Yoon said that they have opposite auras. He said that nothing concerns him when acting because they have unique characteristics. He said both of them have different images at a two-shot. He described Park Sung Hoon as a great actor and they enjoy working together.

Yoon Shi Yoon got the script for the drama while he was filming his previous drama, "Nokdu Flower". When he read the "Psychopath Diary" script, he fell in love with the character. He said that he was like having a crush on the drama that's why he took the role.

On the other hand, Jung In Sun will portray a goal-driven policewoman named Shim Bo Kyung. She said that she has read the script in one sitting. The actress said that she was determined to take the role. She always wanted her character to be employed. She met the drama director and writer as soon as she decided to accept it. She added that she has the same ideas as the production team. Jung In Sun talked about her "girl crush" role. The director told her to act like she always does, so she used to think that way while acting.

Park Sung Hoon plays the role of a cautious psychopath serial killer named Seo In Woo. He said that his friends who worked with the director said positive things about him. He wanted to try working with a kind director. He also enjoyed reading the script, so he took the role. He was asked if he was bothered after taking another villain role after "Justice". Park Sung Hoon said the concern disappeared because he likes the character's charms.

"Psychopath Diary" is set to premiere on November 20 at 9:30 p.m. KST, and will be available on Viki.