Lee Se Na

Gu Seo Jin is a third-generation chaebol who runs the theme park Wonder Land. He seemingly has everything — looks, brains, and fortune. But a traumatic incident in his childhood resulted in Seo Jin having a split personality — one is a cold, ruthless man, while the other is the polar opposite, someone kind and gentle. Because of this, he vows never to date or marry. Seo Jin wants to get rid of the circus show at Wonder Land due to low ticket sales and high overhead costs, but he butts heads with circus master Jang Ha Na. Ha Na insists on saving the failing circus and dreams of revamping it back to its former glory. She soon finds herself falling for both of Seo Jin's personalities. (Source: AsianWiki) ~~ Adapted from the webtoon "Dr. Jekyll is Mr. Hyde" (지킬박사는 하이드씨!) by Lee Chung Ho (이충호).

Early in his reign, King Se Jong accidentally causes the death of his in-laws and their slaves in an attempt to save them from his brutal father, King Tae Jong. Two young slaves, Ddol Bok and his friend Dam, survive, but neither knows the other has. Ddol Bok blames the king and vows to kill him to avenge the deaths of everyone he loves. He spends several years becoming a great warrior. Dam, who has a photographic memory, becomes a court lady called So I, but she feels so guilty about her role in the other slaves' deaths that she is mute. Ddol Bok returns to the palace under the name of Kang Chae Yun in order to kill the king. However, he becomes embroiled in the mystery surrounding the deaths of several Hall of Worthies scholars. The deaths were caused by a secret society called "Hidden Root", which was created long ago by followers of Jung Do Jeon, with the goal of giving more power to ministers and less to the king. King Tae Jong killed Jung Do Jeon and all of his family except his nephew, Jung Gi Jun, who is now the leader of Hidden Root and lives in disguise not far from King Se Jong.