Yacha

Yacha, translated as "Demon," follows two brothers who end up on divergent paths - Baek Rok (Jo Dong Hyuk) is the intensely loyal, protective older brother, and Baek Gyeol (Seo Do Young of Spring Waltz) is the ambitious younger brother striving to move out of Baek Rok's shadow. Both of them love the same woman, Jung Yeon (Jun Hye Bin) and they will do anything to protect her.

When the young king comes to power, he will do anything to assert his control over his unruly royal subjects. To stave off potential coups, he calls upon his childhood friend, Baek Rok, to lead a secret military sect called "Black Cloud Swords." Baek Rok is forced to make questionable, immoral choices as he carries out his king's orders. His actions bring him head-on against Baek Gyeol, who has risen to become an official and married to a powerful minister's daughter. A trap set by his brother forces Baek Rok to go on the run, and once again be separated from his love. He becomes a slave and a warrior, but returns to Joseon seeking revenge against all those who have wronged him.