The night rainbow arches overhead, the wind howls through the lingering snow. Deep in the dark forest, the frost-rimmed moon heralds the dawn. Before the Korean War's Battle of Jincheng, a mysterious unit codenamed "917" carried out undercover reconnaissance around the Jincheng Basin near the 38th Parallel. In their clashes with enemy paratroopers and agents, the unit gathered a wealth of pre-battle and strategic intelligence, laying a solid foundation for victory in the Battle of Jincheng.