Double Agent: Infiltrating the Japanese Invaders’ Ranks

On the very first day after Lu Zheng transmigrates, the System gives him a big surprise: there's a Japanese spy in the training camp.

Can't find them? Better to kill the wrong person than let them go. They all have to die.

Before he can even process the news, Zheng Yaoxian, Sixth Brother of the Military Statistics Bureau, pats him on the shoulder. "Kid, how about becoming my apprentice?"

Lu Zheng: ?