Jo-yoon

Joo Yoon is main antagonist of 2014 South Korean action historical film Kundo: Age of the Rampant is illegitimate son of  nobleman who rise to power as poliction and murderer of Dochi's mother and sister

He was portrayed by Kang Dong-won who played Cho-in in Haunters

About
Joo-yeon was born to nobleman and his counbince who is a gisaeng after his wife didn't bear a son before the couple finally had a son and apodted 10 year old Joo-yoon after death of his mother.Joo Yoon desired to had his father's love for him and jelous of his half-brother who is favorite of his father married his lover. Joo Yeon was trained as swordsman. When he learns his half-brother was killed by thieves leaving his sister in law who pregnant with their child and Joo Yoon deiced to kill her for getting a becoming his father's living heir  also fortune by hiring innocent bucther named Dol Moo-Chi who cut animnal meat for supporting his mother and younger sister. Domoochi refused to kill a pregant widow which Joo Yoon kills his mother and younger sister in front of him. Dohichi was found by band o thevies and joined them for seeker of venagance aginast Joo Yoon for his family's death