tvN revealed a new teaser for its upcoming drama series 'Jirisan', starring Jun Ji Hyun and Joo Ji Hoon on September 19th.

'Jirisan' is a collaboration project between 'Kingdom' series writer Kim Eun Hee and 'Mr. Sunshine's director Lee Eung Bok. The drama will depict the story of Seo Yi Gang (played by Jun Ji Hyun), the best ranger at Jiri Mountain National Park, and Kang Hyun Jo (played by Joo Ji Hoon), a rookie ranger with a dark secret. The drama will follow them as they work to save people inside the Jiri Mountain National Park.

In the second teaser, Jun Ji Hyun narrates, "That day, it wasn't just us at the mountain. Someone on top of that mountain" and Joo Ji Hoon completes the sentence by saying "Is killing people." Following the first trailer, the second teaser further heightened viewers' anticipations.

'Jirisan' will premiere on October 23 at 9 PM KST.