Rescue team member Ajie and his crew managed to save a reef tanker during a storm, but encountered a captain who was obstinate and refused to abandon ship. Meanwhile, a mysterious presence lurked in the depths, pulling everyone into the ocean. From that moment, Ajie, haunted by the loss of his colleagues, fell into a state of despair and despondency. Years later, Ajie confronts his past and boards a fishing vessel once more. They save Xiaojing, who had fallen into the sea after his yacht capsized. However, once aboard, peculiar events begin to unfold. As the group faces the storm’s harsh challenges, they realize that the greatest threat is not the storm itself. Unseen creatures lurk beneath the waves, and the embattled survivors must set aside their differences and unite to endure.