tvN's Korean series Psychopath Diary's casts Yoon Si-yun, Jung In-sun, and Park Seong-hoon's chemistry is amazing. It's only the first day of shooting but these three looks like they've been acting together for the longest time. Their chemistry just comes naturally. The kind that makes you smile when you see it.

The upcoming Korean series "Psychopath Diary" is about a man who accidentally picks up a murderer's diary after he witnessed a murder and lost his memory. When he regained consciousness, he was mistaken as the serial killer.

Lee Jong-jae directs the film. He has also directed "100 Days of Namkun." Furthermore, the plot was written by Ryu Yong-jae whose other works involve "The Time of the Dog and the Wolf" and "The Liar Game." Expectations are quite high for this series.

On October 30th, Psychopath Diary began its filming and its behind-the-scenes video is gaining a lot of attention. In the released behind-the-scenes video, Yoon Si-yoon, Jung In-sun, and Park Sung-hoon's chemistry are captivating.

Yoon Si-yoon said, "The scene is interesting. I am very excited because Dongsik is more stupid than I thought."

Jung In-sun added, "I am filming with great actors and actresses. I will continue working happily with them." Then he flashed a warm smile.

Park Sung-hoon also said, "The team atmosphere is very good. A lot was expecting we'd get along well and they were right."

The behind-the-scenes video includes various actors such as Yoon Si-yoon (Yook Dong-sik), Jung In-sun (Shim Bo-kyung), Park Sung-hoon (Seo In-woo), Lee Han-wi (as Yuk Jong-cheol), Hur Sung-tae (as Jang Chil-sung), Kim Ki-du (as Park Jae-ho), Lee Min-ji (as Omiju), and Choi Sung-won. The warm friendly atmosphere they show makes you drawn into the series.

tvN's drama "Psychopath Diary" will air its first episode at 9:30 pm KST on Wednesday, November 20 following the "Cheonil Electronics Mitsuri."