Fans guessed from the teaser which group it was almost immediately.
The show takes place during the Silla dynasty and Hyungsik plays the role of the king who expanded the territory.
For their third EP, TaeTiSeo will take on a concept that meshes well with the winter season.
The latest teaser features leader Yongguk walking in an eerily empty space, with only foggy darkness in the background.
The new boy band will release the full track on November 10.