Battle of Shangganling.

In 1952, during the Korean War, the volunteer army gains the upper hand after numerous battles. To strengthen their position at the negotiation table, the United Nations Forces make a final stand at Shangganling, launching a fierce assault on October 14. For 43 days, the volunteer soldiers bravely resist and endure intense tunnel warfare under harsh conditions, demonstrating their resilience and determination to leave a lasting impact on the course of history.