On the first video trailer of the drama, Yoon Si Yoon can be seen standing on a rooftop of a hospital while wearing hospital clothing. The actor captured the fans' and viewers' interests due to his gaze, believing that he is a serial killer.

From his eyes, the camera focused on the red diary he was holding which is the "Psychopath's diary". While the video focused on the bloody thing, he is saying something as a background and he said, "The only clue to recovering memory." "This diary is talking. I am a serial killer."

Thus, the trailer raised the anticipation of the fans and viewers for the comeback drama of the actor after "Nokdu Flower" of the same year. The actor has been in demand these past few years and has been working non-stop for the happiness of the people around him which is where he gained his strength.

Meanwhile, the actor started his fame when he appeared on the sitcom drama, "High Kick! 2" as Jeong Jun hyeok who is the brother of a brat sister played by Jin Jin Hee. Also, Yoon Si Yoon played a lot of roles for a romantic drama such as "Flower Boy Next Door", "The Best Hit", and "Grand Prince".

It is expected that in his new drama, Yoon will be going to show a different charm and more intense scenes.

On the other hand, "Psychopath's Diary' revolves around the story of Yook Dong Sik (Yoon Si Yoon) who witnessed a murder and fled with the killer's diary which he picked at the crime scene. However, he was accidentally hit by a police car and lost his memory. For he has the diary, he believed that he is the killer, as well as his attitude also changed. He will then start to seek for the truth.

"psychopath's Diary", directed by Lee Jong Jae, and written by Ryoo Yong Jae, Kim Hwan Chae, and Choi Sung Joon will air this November 20, and will be broadcasted through TvN every Wednesday and Thursday at 21:30 KST.

Jung In Sun, Park Sung-Hoon, Lee Han Wi, Heo Sung Tae, Choi Dae Chul and many more are expected to appear in the drama.