Things are looking pretty exciting for the next episode of Royal Secret Agent. With episode 6, the drama’s viewership ratings rose to 4.9 percent and 6.5 percent—their highest recorded one yet—from the previous episode’s 5.7 percent and 5 percent. As Sung Yi-gyum (Kim Myung-soo) rejects the Chief State Councilor Kim Byeong-geun’s (Son Byung-ho) marriage proposal, he officially becomes the councilor’s enemy. As he sails off to new adventures, more shocking revelations await him at his next destination.
Hong Da-in blackmails Sung Yi-gyum
Hong Da-in (Kwon Na-ra) has her own personal agenda for tagging along to Yi-gyum’s mission, but Yi-gyum refuses to bring her along. Later on, she learns of Yi-gyum’s secret—that his younger stepbrother is the leader of a group of bandits—and uses it to blackmail Yi-gyum. Left with no choice, he finally agrees to take Da-in with him.
Sung Yi-gyum embarks on a new mission
Together with Park Chun-sam (Lee Yi-kyung) and Da-in, Yi-gyum sets off to the town of Chungju to begin his investigation and track down his younger brother Sung Yi-beom (Lee Tae-hwan) and his gang. On their first night in the town, their money gets stolen. While pursuing the thief, the three come across a nobleman’s home that has been attacked by the bandits earlier that night and find everybody dead. In the morning, the sheriff (Yang Hyun-min, The Good Detective) himself goes to the crime scene to personally investigate. Da-in recognizes him as the former Department of Justice secretary whom she has reported for corruption in the past.
Sung Yi-gyum is forced into a death match
While Yi-gyum and Da-in invade a certain gambling house, they bump into the sheriff, who immediately recognizes Da-in and tries to kill her. To save Da-in, Yi-gyum is forced into a deathmatch with the sheriff, putting his and Da-in’s lives on the line. Despite Yi-gyum’s bad luck in gambling, he still tries to cheat his way to win the match. While they escape, a woman who looks like his ex-lover Kang Soon-ae (Jo Soo-min) catches his eye. While running after her, Yi-gyum is intercepted by the sheriff’s men and is brought to the woods to be killed.
Sung Yi-beom saves Sung Yi-gyum from death
Yi-gyum, Da-in, and Chun-sam are all brought to the woods by the Sheriff’s order. Yi-gyum makes one last attempt to fight back, but the Sheriff goes straight for Da-in and tries to kill her himself. Before he could strike his sword at Da-in, they are ambushed by the bandits, and the sheriff and his men are forced to step back and flee. Yi-beom then reveals himself and faces his brother Yi-gyum, whom he has not seen for a long time.