Kid Cast Away 2013.

So Yeon, a teenager from a happy home, goes fishing one day with her father in the South Pacific Ocean and faces an accident. She is lost at sea with her pet dog, Happy and ends up in a deserted island. She believes her father will come and save her there and survives in the wilderness of the island. One day, a mass crowd of cannibals appear in the jungle and try to hurt the natives there but So Yeon saves them and they become friends. However, she can't shake off the feeling that someone is watching her.