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.
Elenco: Doh Kyung-soo , Nam Ji-hyeon , Cho Seong-ha , Jo Han-chul , Oh Yeon-ah , Ji Min-hyuk , Kim Sun-ho , Jeong Hae-gyun , Han So-hee , Heo Jung-min , Kim Jae-young , Jo Hyun-sik , Ahn Suk-hwan , Kim Ki-Doo , Lee Min-ji , Lee Jun-hyeok , Jung Ji-hoon , Heo Jung-Eun , Jeong Joon-won .