L.U.C.A.: The Beginning poster
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L.U.C.A.: The Beginning

TV·2021–2021·1 season, 12 episodes·tvN·Mystery, Sci-Fi & Fantasy, Action & Adventure

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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.

Highest-rated episodes all ranked

  1. 01L.U.C.A.: The Beginning S01E10Episode 10S01E10 · 8.0Ji O falls into despair when his only friend, Won Yi, faces danger because of him. He becomes more desperate to find Gu Reum and their baby and makes riskier moves. Meanwhile, a group of men raids the hotel where Gu Reum was being held captive. After she is dragged off to another place, Gu Reum must fight against her captors to protect her child.
  2. 02L.U.C.A.: The Beginning S01E01Episode 1S01E01 · 7.0Ji O wakes up from losing his consciousness and has no clue where he is. In fact, he isn’t sure who he is either. He just knows that he has a body covered in wounds and there are fallen people all around him. One man walks up to him with a knife in his hands. A year goes by and Gu Reum, a police officer, finds out that the man she was searching for is dead.
  3. 03L.U.C.A.: The Beginning S01E04Episode 4S01E04 · 6.0Ji O remembers that he burned down the orphanage as a child and is in a state of shock. Gu Reum takes him to Jong Hwan at the NFS where he undergoes a number of tests to find out about himself. However, Ji O recalls more horrific memories while being poked and prodded. He runs away and ends up going to see an old friend.

Castfull cast & details

Kim Rae-wonKim Rae-wonJi-OLee Da-heeLee Da-heeHa Neul Ae Gu-ReumKim Seung-oKim Seung-oYi-SonKim Sang-hoKim Sang-hoChoi Jin-HwanJin KyungJin KyungHwang Jung-APark Hyuk-kwonPark Hyuk-kwonKim Cheol-SooAhn Nae-sangAhn Nae-sangRyu Joong-KwonJeong Da-eunJeong Da-eunYoo-Na

Episodes by season

Season01Episode ratings across the season — the gold bar is its best episode12Episodes2021Aired 6.3Season avg
  1. S01E01L.U.C.A.: The Beginning S01E01Episode 1February 1, 2021 7.0Ji O wakes up from losing his consciousness and has no clue where he is. In fact, he isn’t sure who he is either. He just knows that he has
  2. S01E02L.U.C.A.: The Beginning S01E02Episode 2February 2, 2021—Ji O gets admitted to the ICU after suffering extensive injuries from the fall. Gu Reum also ends up in the hospital where she suddenly reme
  3. S01E03L.U.C.A.: The Beginning S01E03Episode 3February 8, 2021—Ji O takes Gu Reum somewhere safe to heal her injuries. Gu Reum asks Ji O questions about her parents, but he doesn’t remember anything abou
  4. S01E04L.U.C.A.: The Beginning S01E04Episode 4February 9, 2021 6.0Ji O remembers that he burned down the orphanage as a child and is in a state of shock. Gu Reum takes him to Jong Hwan at the NFS where he u
  5. S01E05L.U.C.A.: The Beginning S01E05Episode 5February 15, 2021—Gu Reum brings Ji O home since he has nowhere else to go or anyone to depend on. There, Ji O comes to understand just how desperate and lone
  6. S01E06L.U.C.A.: The Beginning S01E06Episode 6February 16, 2021 4.0Ji O returns to the lab where he lived as a child. An unexpected someone comes to meet Ji O and tells him a shocking truth. Meanwhile, Gu Re
  7. S01E07L.U.C.A.: The Beginning S01E07Episode 7February 22, 2021—Gu Reum and Ji O are reunited in the fiery mess of Human Tech’s secret lab. Gu Reum tries to stop him, but Ji O loses control while fighting
  8. S01E08L.U.C.A.: The Beginning S01E08Episode 8February 23, 2021—In order to protect Gu Reum, Ji O takes her to a ranch where he used to work years ago. As the two spend their days together, Ji O enjoys th
  9. S01E09L.U.C.A.: The Beginning S01E09Episode 9March 1, 2021—Captain Choi shows up at the place where Gu Reum and her baby are being held captive. He tells Gu Reum something she finds hard to believe a
  10. S01E10L.U.C.A.: The Beginning S01E10Season's bestEpisode 10March 2, 2021 8.0Ji O falls into despair when his only friend, Won Yi, faces danger because of him. He becomes more desperate to find Gu Reum and their baby
  11. S01E11L.U.C.A.: The Beginning S01E11Episode 11March 8, 2021—Ji O feels a sense of emptiness as the cult followers cheer for him, believing that he is an angel from above. He then decides to cross the
  12. S01E12L.U.C.A.: The Beginning S01E12Episode 12March 9, 2021—Ji O dreams of creating a new world for Gu Reum and their baby, but Gu Reum wishes Ji O would come back to being more human, as he was befor

Season 1 ranked & reviewed

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