King of agents: I can upgrade infinitely

Zhou Lin crossed over and became a member of the military commander.And got a system.
"You kill a Japanese soldier. Get a reward. The reward is the technical expertise of the deceased."
"Elementary marksmanship, ten spears and fifty rings."
"Elementary boxing, the impact force of each punch is [-] kilograms."
"Please choose one and add it to your technical expertise. Please choose!"
Zhou Lin: "I choose one, primary marksmanship."
"Congratulations on your marksmanship upgrade, you are now at the elementary level of marksmanship."

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