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|“||Don't worry, Baek Hwa. You're not alone. I, your brother, will protect you.||”|
–To Sa Baek Hwa
Hyun is the son of Minister Sa Hwa Hyeon and the older brother of Sa Baek Hwa. His father was arrested by Yi Ha under the orders of King Jin Hyul for committing treason. He, along with his mother and sister, was imprisoned after his father's death. While imprisoned, his mother committed suicide by hanging herself. Thereafter, he and Baek Hwa were transferred to a prison in the streets where people jeered at them, calling them traitors. He then pledged to protect Baek Hwa until they are set free and prove their father's innocence. They were later set free, hoping to receive full pardon in ten years' time. Within those times, he and her sister gathered as much information as they need as evidence to prove their father's innocence.
One night, Yi Sae Gi attacked Baek Hwa, and Hyun is stabbed by Sae Gi while protecting his sister. In return to spare their lives, Hyun stabbed his own sister in order to escape her fate. He was able to survive his stab, disposing of Baek Hwa's body as a way of "protecting" her from Sae Gi. 
|Characters of Twelve Nights|
|Royal Family||Ahn Young • Hyun Bin • Jin Hyul • Jin Jeok • Jin Won • Unnamed Baby Prince • Unnamed Baby Princess • Yi Hwi • Yi Sae Gi • Yoon Yeon Lee|
|Ministers||Hwang Se Hyung • Kim Hak Gyu • Sa Hwa Hyeon • Seo In Seon Woo • Wi Ji Hyun • Yi Ha • Yoo Ja Gyeom|
|Bi Yeong Pal Mu||Baek Ah • Baek Ju • Baek Lin • Baek Ryung • Baek Sa • Heuk Rang|
|Bi Yeong Ship Mu||Baek Ho • Baek Yoo Shin • Gil Mu Jin • Yi Ha|
|Deung Ha Bul Myung||Baek Ho • Crimson Moon • Gil Mu Jin • Nabi • Seol Hwa • Seo In Seon Woo • Wol Young Hwa • Yi Hwi • Yi Jeok|
|Yu Hyang Ru||Nabi • Wol Young Hwa • Yi Jeok|
|Others||Chung • Hwang Se Ryeon • Hyun • Ma Mi Song • Nam Yang Heon • Sori • Woon • Yi Ha's Wife • Yoo Dan Ah • Yoo Dan Ah's Mother|
|Royal Family||First Prince • First Princess • Jang Rei • Jang Rok Ha • Jang Ryun • Second Princess • Three Wives of Jang Ryun • Unnamed Baby Prince • Unnamed Baby Princess • Yeong Bi|
|Others||Gwak Ji Ryeon • Meng Gyeom|