Three Kingdoms: before lying flat, dragging Zhao Yun to defect to Cao

Once Tong Fei traveled through the dynasty and came to the end of Han Dynasty, he became the biological son of spear prodigy Tong Yuan, and the fellow disciples of Zhao Yun, Zhang Ren, and Zhang Xiu.
But Tong Fei's aptitude is really bad, but fortunately he has awakened [Lying Flat Sign-in System].
As long as you join any of the historical princes' forces, you can get the "Land Immortal" cultivation base and live the same life as the world by signing in low-key for 20 years.
After some selection, Tong Fei decided to drag Zhao Yun to join Cao Cao.
Hehe, with Zhao Yun's cover, you can lie down and be a salted fish in Cao Ying in the future, right?
What Tong Fei didn't expect was that Cao Cao could hear his voice!
[It's over, Boss Cao, don't go crazy, we can't go after Dong Zhuo, there are Xu Rong's ambush ahead! 】
"My lord, you are right. It makes sense. This time I will definitely be able to fight against Xuzhou."
[I'm afraid that Lu Bu will steal the house, and there will be no pants left. 】
Cao Cao: "Can you be more duplicity, kid?"
Many years later, when the Great Wei was established, Xianyu Tongfei somehow became the number one hero.