SEE ALSO: Yonghwa and more attend script reading for 'The Three Musketeers'

Yonghwa transformed into a fighter from the Joseon Dynasty and showed off his swordsmanship, while Lee Jin Wook was ablaze with charisma, ready to fight and defend as the crown prince.

'The Three Musketeers', which is the work of 'Nine's director Kim Byung Soo and writer Song Jae Jung, is set in the time of the Joseon Dynasty. The drama portrays the adventure of Park Dahl Hyang (Yonghwa) who comes from a poor family but is of noble birth and tries out for the military force, joining the Crown Prince Sohyeon (Lee Jin Wook) and his warrior guards Heo Seung Po and Ahn Min Suh. Yonghwa's character will be in a love triangle with Yoon Suh (Seo Hyun Jin) and the Crown Prince (Lee Jin Wook).

'The Three Musketeers' is set to air every Sunday starting August 17!