Choi Sung-hyun
An ace police crisis negotiator, Chae-yoon, is called to the scene where her supervisor is taken hostage. Through the control room monitor, she is faced with the cold-blooded hostage taker, Tae-gu, whose demeanors are difficult to interpret. Against the 21-hour deadline Tae-gu has set, Chae-yoon tirelessly tries to crack the unusually calm perp over multiple video-calls. Eventually, the shocking truth begins to unveil.
An older brother is a washed-up boxer. His younger brother is a genius pianist with physical disability. The brothers make up through their mother who is full of stories of her past.
In 1777, one year since he had taken reign, King Jeong-jo bears a perilous palace life with his dedicated court servant, Gap-soo, amidst opposition and threats from those around with political ambitions. Meanwhile, Eul-soo, a member of a secret assassin group, receives orders to kill Jeong-jo. Gap-soo, who had also been in the same secret assassin ring as Eul-soo, later confesses to Jeong-jo about his dark past and his motive for coming into the palace. To Gap-soo's surprise, Jeong-jo asks Gap-soo when he had given up being an assassin, then orders him to just leave the palace. However, Gap-soo finds out that there is another assassin besides him and frantically returns to the court, only to discover Eul-soo in combat with Jeong-jo. (c)
