In the South China Sea in the 1980s, typhoons, reefs, smuggling ships and unidentified submarines made Qingjiao Island the most dangerous frontline of coastal defense.
Gu Chenzhou, the ace of the Marine Corps, lost his one-year-old daughter Duoduo four years ago while fighting a typhoon.
The wife died in the waves while trying to save her child, and her daughter was also caught in the eye of the storm, her life or death unknown.
From then on, Gu Chenzhou, carrying a lifetime of guilt, asked himself to be stationed at Qingjiao Island, patrolling the sea every day, just waiting for an almost impossible miracle.
But Duoduo is alive.
She was carried onto an uninhabited reef by an injured killer whale, and was fed by a pod of dolphins in turn.
A few years later, the little girl became a "little whale master" in the sea and could understand whale songs, turtle language, and seabird signals.
She rode the killer whale "Obsidian" through the wind and waves, commanded the seagulls to keep track, asked the crabs to cut the smugglers' ropes, and made the sea snakes scare the enemies into jumping into the sea in the middle of the night.
Four years later, overseas espionage organizations made a comeback. They took advantage of the typhoon to steal half of the coastal defense map. Now they want to find the other half and smuggle the latest sonar data out of the country.
Gu Chenzhou was ordered to investigate, but found that the sea was becoming more and more "unreasonable".
