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.

• Doh Kyung-soo
• Nam Ji-hyun
• Cho Seong-ha
• Jo Han-chul
• Oh Yeon-ah
• Ji Min-hyuk
• Kim Seon-ho
• Jung Hae-kyun