Shin Kyung Soo

Follow the joint operations of a police force and a fire department, who together will tell a thrilling story. Fierce detective Jin Ho Gae is all about catching low-lifes. He solves cases with his excellent ability to grasp crime scenes, read a criminal's mind, and has a strong will to win. While the fearless firefighter Bong Do Jin, who seems cold on the outside, is nice to those around him, and he takes good care of victims. He rushes to fire sites without a moment of hesitation. Joining the duo is Song Seol, an empathetic paramedic who heals broken hearts while treating wounds. (Source: pinkvilla.com)

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.