8 episodes • December 24, 2021 - December 24, 2021

During a perilous 24-hour mission on the moon, space explorers try to retrieve samples from an abandoned research facility steeped in classified secrets.

8 episodes

1. 

   #1

   Balhae Lunar Research Station

   51 min • Dec 24, 2021 (4 years ago)

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

2. 

   #2

   Three Storages

   47 min • Dec 24, 2021 (4 years ago)

   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.

3. 

   #3

   Cause of Death

   48 min • Dec 24, 2021 (4 years ago)

   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.

4. 

   #4

   The Truth Comes Out

   45 min • Dec 24, 2021 (4 years ago)

   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.

5. 

   #5

   Secret Storage

   40 min • Dec 24, 2021 (4 years ago)

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

6. 

   #6

   Key to Salvation

   44 min • Dec 24, 2021 (4 years ago)

   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.

7. 

   #7

   Luna

   40 min • Dec 24, 2021 (4 years ago)

   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.

8. 

   #8

   The Silent Sea

   48 min • Dec 24, 2021 (4 years ago)

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