Season 1

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  6.7/101,049 votes

  Balhae Lunar Research Station

  Season 1 Episode 1 - Aired 12/24/2021

  Director Choi's briefing about the mission leaves Song Ji-an displeased. Reaching the research station alone proves no easy feat for the crew.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.0/10861 votes

  Three Storages

  Season 1 Episode 2 - Aired 12/24/2021

  The crew's initial findings are at odds with their knowledge of the research station. Split into threes, the members set out to look for the sample.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.1/10829 votes

  Cause of Death

  Season 1 Episode 3 - Aired 12/24/2021

  Ji-an's body cam captures a startling moment of life and death. Submerged in sweat, Gong Soo-chan shows worrisome signs of an unusual infection.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.2/10805 votes

  The Truth Comes Out

  Season 1 Episode 4 - Aired 12/24/2021

  Han Yun-jae updates the director and gets access to a restricted area. The crew learns of the sample's powers and the true motive behind their mission.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.2/10784 votes

  Secret Storage

  Season 1 Episode 5 - Aired 12/24/2021

  Recalling her sister's encrypted message, Ji-an searches the database for Luna. A young intruder and a double-crosser emerge from the shadows.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.1/10749 votes

  Key to Salvation

  Season 1 Episode 6 - Aired 12/24/2021

  E2, Ryu Tae-suk and the samples go missing. Seeing a familiar name on the intruder, Ji-an follows her down the vents for answers.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  7.2/10743 votes

  Luna

  Season 1 Episode 7 - Aired 12/24/2021

  Ji-an opens a hard drive that chronicles Song Won-kyung's life and work on the station. Meanwhile, others uncover the remains of the experiment.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo

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  6.9/10858 votes

  The Silent Sea

  Season 1 Episode 8 - Aired 12/24/2021

  Racing against time as the research station falls under destruction, the surviving crew members decide on the fate of the mission — and their own.

  Director: Choi Hang-yong

  Writer: Park Eun-kyo