100 Days My Prince 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. Details Casts Videos Galleries Posters Season Lists Title 100 Days My Prince Genres Comedy Drama Mystery First Air Date 2018-09-10 Last Air Date 2018-10-30 Episode Runtime 01 Hours 15 Minutes Total Season(s) 1 Total Episode(s) on All Seasons 16 Runtime 75 Production Companies AStory, Studio Dragon Doh Kyung-soo... Crown Prince Lee Yool / W... Nam Ji-hyun... Hong-sim / Yoon Yi-seo... Cho Seong-ha... Kim Cha-eon... Jo Han-chul... King... Oh Yeon-ah... Queen Park... Ji Min-hyuk... Prince Seo-won... Kim Seon-ho... Jung Je-yoon... Jung Hae-kyun... Hong-sim's Stepfather... Han So-hee... Kim So-hye... Heo Jung-min... Kim Soo-Ji... Kim Jae-young... Moo-yeon... Jo Hyun-sik... Eunuch Yang... Ahn Suk-hwan... Lord Park Sun-do... Kim Ki-doo... Goo-dol... Lee Min-ji... Kkeut-Nyeo... Lee Jun-hyeok... Park Bok-eun... Jung Ji-hoon... Young Lee Yool... Heo Jung-eun... Young Hong-sim / Yoon Yi-... Jeong Joon-won... Young Yoon Seok-ha... Do Ji-han... Dong-joo... 100 Days My Prince | Trailer (Trailer) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (1609x905) Original Size (1280x720) Original Size (3840x2160) Original Size (1280x720) Original Size (1280x720) Original Size (1000x1500) Original Size (2000x3000) Original Size (950x1425) Original Size (950x1425) Original Size (950x1425) Original Size (770x1080) Original Size (1200x1719) Original Size (577x866) Original Size (577x866) Original Size (950x1425) Original Size (1000x1433) Original Size (1000x1433) Original Size (1000x1500) Season 1 16 Episode(s) 2018-09-10