Why does Luna have gills in the silent sea?

The girl has cheeks on her face, and the wound can heal quickly because she drank the water from the moon! In 2075, the exhaustion of natural resources destroyed the earth, and an elite team was sent to an abandoned research base on the moon to perform a special task. On Christmas Eve, astrobiologist Song An Zhi (Bae Doo Na) just landed on the moon. She is a member of this elite team, sent to the moon, shouldering the mission of saving the earth with exhausted natural resources. For human beings, the moon is still an infinitely mysterious place, and many fields are unknown. In the process of searching for clues to save the earth, the team members fell into the mysterious dilemma of outer space and unforeseen events. Their fate is at stake.