Anti-Japanese War: They Kill the Enemy, I Lie Flat and Upgrade

[Anti-Japanese War Spy], [Upgrade Flow], [System]. Traveling through the Anti-Japanese War, I was chased by Japanese special agents at the beginning. I bound a cold and beautiful female agent. I gain experience when she kills enemies. When she is injured, I lose 50% of my HP! In order to survive, I could only force her to work for me with tears in my eyes. Xia Yubing: "Lu Fan, you are shameless!" "Stop it, go get that team of devils, so I can upgrade and give you a Barrett!" "Go ahead"