Duel

Lee Yool falls off a cliff and nearly dies in an attempted assassination. He loses his memory, and wanders for 100 days under a new name and personality. During this period, he meets Hong Sim, head of the first detective agency in Joseon.

The story of a man named Yook Dong-sik who coincidentally witnesses a murder and picks up the killer's diary. While fleeing the scene, he gets into a car accident causes him to lose his memory. Due to the diary in his possession, he mistakenly believes that he is a psychopathic serial killer.

Prince Lee Hwan receives a cursed letter from a supernatural entity detailing several dark predictions for his future and is horrified to realize that the curses are indeed coming true one by one. Min Jae-yi, on the other hand, finds herself wanted by the local authorities after being unjustly accused of murdering her family members and unilaterally calling off her arranged marriage.