Chen Xiao, a college student in the Department of Modern History, traveled to the Cangyunling battlefield in 1940 and was bound by the "Iron-Blooded Battle System". The rules of the system are simple and crude: personally participate in combat missions to obtain merit points, which can be exchanged for weapons, ammunition, medicines and training manuals of the same era. Relying on his understanding of the history of the war and his bold and careful character, Chen Xiao made a splash during the breakout battle at Cangyunling, gained Li Yunlong's trust, and officially joined the new regiment.
