Alternate Titles: Shen Hai
Shenxiu was abandoned by her mother when she was a child. Since then, she has bad dreams about a monster called “Nightmare”.
One day, she travels on a cruise ship with her family. On a stormy night, she sees "Nightmare" on the deck, humming her mother's song and calling her to the sea. She falls and breaks into the fancy “Deep Sea” restaurant, an old, transformed submarine. She meets the Chef, Nanhe, and embarks on a mysterious journey.