Dong-ho is ranked number 1 in "Arena," an illegal gambling league for teens, but he steps down to prepare for college. However, the members of "Arena" don't want to lose their biggest money-maker, so they place a debt on his brother Dong-min. Dong-min literally fights against his debt, but when he gets hurt, Dong-ho decides to fight back.

A series of mysterious taxi murders continue to happen and rumor has it that the victims are all the same high school graduates. Yeon-jeong, Jin-ki and Lee-seon make a great plan to investigate this case and upload the process on YouTube to become a ten million YouTuber… One day, a mysterious taxi appears in front of Yeon-jeong and her friends! A series of horrible moments are about to unfold before them! There’s another truth to “Nightscape”, a Montreal International Film Festival nominee. What is this murder taxi that these teenagers managed to get on film!

On Min-jae's birthday, his lover Geon-woo book a restaurant. It was Hyun-soo, the former lover of Min-jae and Chef who appeared in front of the two people at the restaurant. Although the two pretend they don't know each other, a strange atmosphere emerges between the three.

Holy Night is team that fights against groups that worships demons. The members of the Holy Night team are Bau (Ma Dong-Seok), Sharon (Seohyun) and Kim-kun (David Lee). Bau's special ability is his powerful physical strength. Sharon has an ability to identify demons and performs exorcisms. Kim-kun helps Bau and Sharon. Meanwhile, Psychiatrist Jung-won (Kyung Soo-Jin) visits the Holy Night team to save her younger sister Eun-seo (Jung Ji-So). A demon resides in Eunseo’s body.

Detective Ma Seok-do changes his affiliation from the Geumcheon Police Station to the Metropolitan Investigation Team, in order to eradicate Japanese gangsters who enter Korea to commit heinous crimes.

'Monster Cop' Ma Seok-do investigates an illegal online gambling business led by a former STS Baek and an IT genius CEO Chang. Ma proposes an unexpected alliance to Jang and begins hunting down the criminals.