8 episodes · first aired 2021-12-24
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | Balhae Lunar Research Station 2021-12-24 | Director Choi's briefing about the mission leaves Song Ji-an displeased. Reaching the research station alone proves no easy feat for the crew. | 2021-12-24 | 6.4 |
 | 02 |
Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.
Three Storages 2021-12-24 |
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. |
| 2021-12-24 |
| 6.6 |
 | 03 | Cause of Death 2021-12-24 | 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. | 2021-12-24 | 6.6 |
 | 04 | The Truth Comes Out 2021-12-24 | 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. | 2021-12-24 | 6.9 |
 | 05 | Secret Storage 2021-12-24 | Recalling her sister's encrypted message, Ji-an searches the database for Luna. A young intruder and a double-crosser emerge from the shadows. | 2021-12-24 | 6.7 |
 | 06 | Key to Salvation 2021-12-24 | 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. | 2021-12-24 | 6.7 |
 | 07 | Luna 2021-12-24 | 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. | 2021-12-24 | 6.7 |
 | 08 | The Silent Sea 2021-12-24 | Racing against time as the research station falls under destruction, the surviving crew members decide on the fate of the mission — and their own. | 2021-12-24 | 6.9 |
