OCN’s upcoming drama “Watcher” has released thrilling new character teasers for its main cast.

The new weekend drama stars Han Suk Kyu, Seo Kang Joon, and Kim Hyun Joo, telling the story of a group of an anti-corruption team trying to uncover corruption within the police force. Han Suk Kyu will lead the team as police officer Do Chi Kwang, while Seo Kang Joon will play policeman Kim Young Goon, and Kim Hyun Joo will take on the role of lawyer Han Tae Joo.

The character teasers center around the thought-provoking tagline, “Who watches the watchers?” Han Suk Kyu is listening to an audio recording of something while Seo Kang Joon sits on a bus and Kim Hyun Joo reads over documents in a car. Ominous music plays as it appears they are observing other people, with Han Suk Kyu looking through a glass pane at another police officer, Seo Kang Joon sitting on the bus and looking at the reflection of a man on the bus window, and Kim Hyun Joo being approached by a mysterious figure whom she hands her documents to.