Based on comic "Yeonmo" by Lee So-Young (published from 2011 to 2014 by Daewon C.I.).
Filming was halted on July 26, 2021, as one of the production staff who participated in the July 24 filming was tested positive for COVID-19. All of the cast members and production staffs were subsequently tested and went into self-quarantine on the same day. After several cast members tested negative, on July 28, it was announced that filming has been resumed.
On August 6, it was revealed that filming was cancelled due to a fire that broke out a day earlier, at 21:10 KST, when the crew was filming at the Korean Folk Village in Yongin, Gyeonggi Province. The fire was extinguished by firefighters within 20 minutes.
"The King's Affection" takes over KBS2's Monday & Tuesday 21:30 time slot previously occupied by "Police University" and followed by "Moonshine" on December 20, 2021.
Episode 20, in the king's court when they are alone, you will see a man accidentally standing in the corner behind ji hyun.