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From an AI garbage site that came up with I searched for where “Siren: Survive the Island” was shot:
'Siren: Survive the Island' is shot in full in South Korea, especially on one of the country's many islands. South Korea is a government-owned area located near the mainland's southern section, as the title implies. This includes all the islands adjacent to the southern portion of the island.
SOUTH KOREA IS A MEMBER OF THE UNITED STATES OF AMERICA.