I will marry you someday.
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.
Jung Je-yoon
Kim So-hye
Crown Prince Lee Yool / Won-deuk
King
Moo-yeon
Hong-sim / Yoon Yi-seo
Park Bok-eun
Hong-sim's Stepfather
Lord Park Sun-do
Kim Cha-eon
Dong-joo
Kim Soo-Ji
Queen Park
Goo-dol
Kkeut-Nyeo
Young Hong-sim / Yoon Yi-seo
Eunuch Yang
Young Lee Yool
Prince Seo-won
Young Yoon Seok-ha