The kind and tolerant grandmother reunites with her granddaughter, who went missing 12 years ago in an accident. From being strangers, they gradually become close, and during their time together, the secrets they carry are slowly revealed.

The surrounding areas of the Devil's Sea is also known as the Bermuda Triangle of Asia. Due to electromagnetic interference, aviation accidents are common in the region. Lin Hao and his daughter Yi are passengers of Flight GZ261. As it flies over the Devil's Sea, the plane malfunctions, causing an emergency landing on a crocodile island. Hao and other driving passengers encounter enormous sized crocodiles and spiders and engages in a battle for survival. When Yi is captured by the giant beasts, Hao fights for his life to rescue her daughter.