Great Tang: Li Er, Are You Telling Me What to Do?

[Tang Dynasty + sign-in System + farming + genius + emperor] Li Yun transmigrated to the Tang Dynasty, and at first everyone thought he was an idiot. Luckily, he awakened a sign-in System. By signing in at different locations, he could claim all kinds of rewards. “Ding! Congratulations, Host, your check-in was successful. Reward: Wing Chun mastery!” “Ding! Congratulations, Host, your check-in was successful. Reward: potato and sweet potato seeds!” “Ding! Congratulations, Host, your check-in was successful. Reward: recipes for soy sauce, perfume, and soap.” “Ding! Congratulations, Host, your check-in was successful. Reward: AK-47 blueprints...” Before he knew it, more and more people had discovered that Li Yun was an unparalleled genius, and the mighty course of Tang history had been changed because of him!