The Silent Sea (2021) is a South Korean sci-fi thriller series set in a dystopian future where Earth suffers from extreme water shortages. A team of elite astronauts, led by astrobiologist Song Ji-an (Bae Doona) and Captain Han Yoon-jae (Gong Yoo), is sent on a perilous mission to the abandoned Balhae Lunar Research Station. Their goal is to retrieve a mysterious sample that holds the key to humanity’s survival. However, as they navigate the desolate station, they uncover dark secrets about the mission and a deadly, water-based life form that threatens their survival.

As the team struggles with internal conflicts and the station’s hidden dangers, they realize that the research conducted there involved unethical experiments with lunar water, a substance that multiplies uncontrollably and proves lethal to humans. With time running out and trust eroding, Song Ji-an seeks the truth behind her sister’s death, which is linked to the station’s past experiments. The series masterfully blends suspense, mystery, and emotional depth, keeping viewers on edge until its dramatic and thought-provoking conclusion.