About L.U.C.A.: The Beginning
Ji-O has a special power and a secret, but he doesn't know who he really is. He is chased by mysterious figures, while he tries to find answers to numerous questions that surround him. Goo-Reum is a detective. When she decides on a course of action, she won't change no matter what. Her parents disappeared when she was only a young child. Goo-Reum chases after the truth behind her parents' disappearance. She meets Ji-O and her life changes.
Main Cast of L.U.C.A.: The Beginning
Kim Rae-won
plays Ji-O (12 episodes)
Lee Da-hee
plays Ha Neul Ae Gu-Reum (12 episodes)
Kim Sung-oh
plays Yi-Son (12 episodes)
Kim Sang-ho
plays Choi Jin-Hwan (12 episodes)
Jin Kyung
plays Hwang Jung-A (12 episodes)
Park Hyeok-kwon
plays Kim Cheol-Soo (12 episodes)
Ahn Nae-sang
plays Ryu Joong-Kwon (12 episodes)
Jeong Da-eun
plays Yoo-Na (12 episodes)
Han Kyu-won
plays Kim Jin-Soo (12 episodes)
Kim Min-gwi
plays Kim Tae-Oh (12 episodes)
Go Jin-Soo
plays [Detective] (12 episodes)
Moon Jung-dae
plays [Detective] (12 episodes)
Lee Joong-ok
plays Kim Hwang-Shik (12 episodes)
Ahn Chang-hwan
plays Won Yi (12 episodes)
Lee Hae-yeong
plays Oh Jong-Hwan (12 episodes)
Hwang Jae-yeol
plays Kim Yoo-Chul [Detective] (12 episodes)
Secondary Cast of L.U.C.A.: The Beginning
Yoo Byeong-hun
plays [Employee] (1 episode)
Bae Ho-geun
plays [Chief researcher] (1 episode)
Park Kyung-Soon
plays [Researcher] (1 episode)
Oh Han-kyul
plays Ji Oh [Young] (1 episode)
Lee Dong-kyu
plays [TBM reporter] (1 episode)
Kim Hyung-min
plays Ha Young Jae (1 episode) , Ha Young-Jae (1 episode)
Lee Doll-hyung
plays Doctor (1 episode)
Choi Nam-wook
plays Subway train driver (1 episode)
Lee Ga-heun
plays Gu Reum's mother (1 episode) , [Gu Reum's mother] (1 episode)
Seo Eun-Sol
plays Gu Reum [Young] (2 episodes)
Lee Won-jong
plays Kim Man-Shik (2 episodes)
Lee Yong-nyeo
plays Sister Stella (2 episodes)
Gong Sang-a
plays Nun (2 episodes)
Han Gan-Ho
plays Doctor (1 episode)
Shin Yeon-woo
plays Pregnant woman (1 episode)
Sung Do-hyun
plays Jung Ah's subordinate (1 episode)
Yoon Jong-goo
plays Vengeful church member (2 episodes)
Kim Sung-yong
plays Church executive (1 episode)
Ahn Seong-bong
plays Kim Cheol Soo's assassin (1 episode)
Jung Eun-chae
plays Attorney Jung (4 episodes)
Crew of L.U.C.A.: The Beginning
![Go Jin-Soo as [Detective]](https://image.tmdb.org/t/p/w185/oIsoQwbryBJvOE7nJUOEOpqE8ti.jpg)
![Moon Jung-dae as [Detective]](https://image.tmdb.org/t/p/w185/8G1amZNg5QcqeBPX0RQmqPMB1Yj.jpg)
![Hwang Jae-yeol as Kim Yoo-Chul [Detective]](https://image.tmdb.org/t/p/w185/cyEibdvqNRurcNC63gqDSvX1qzE.jpg)
![Yoo Byeong-hun as [Employee]](https://image.tmdb.org/t/p/w185/5E3tvk5Y1IBOV26SIE30s49pqlT.jpg)
![Bae Ho-geun as [Chief researcher]](https://image.tmdb.org/t/p/w185/q1Gf8RUgYw0MsztQkfevYpYijX.jpg)
![Park Kyung-Soon as [Researcher]](https://image.tmdb.org/t/p/w185/kyJJYMmznWODL9mQnxEtK4FzO9h.jpg)
![Oh Han-kyul as Ji Oh [Young]](https://image.tmdb.org/t/p/w185/gighqxdLK8CnpPim2MTgfBsb1hS.jpg)
![Lee Dong-kyu as [TBM reporter]](https://image.tmdb.org/t/p/w185/5YSsAJQETVIkzDiOaCk1A0tQoA3.jpg)
![Seo Eun-Sol as Gu Reum [Young]](https://image.tmdb.org/t/p/w185/Z2mjBzsnOBIB5ePh7G0vdbMJbR.jpg)
