SEE ALSO: 'The Night Watchman' releases teaser, poster, still cuts, and BTS clips featuring Yunho, Jung Il Woo, and more

The idol-actor showcased the swordsmanship skills that he acquired through training with a martial arts director on set in Yongin, Gyeonggido. Although it was his first shoot, he adjusted quickly and was dripping with sweat, showing his hard work and impressing the staff.

Yunho plays the role of Moo Seok in the fantasy-romance drama about ghosts set during the Joseon Dynasty.�'The Night Watchman' is set to premiere following 'Triangle' on August 4 at 10 PM KST!