I Join the Army for My Younger Brother, and When I Return Home After a Successful Career, You Are Told That I Am a Commoner?

(Historical writing + Decisive killing + Traveling through ancient times + Modern technology) Su Qin traveled to the ancient world and became the eldest son of a concubine in the Yanhou family of Ningguo. He suffered a lot because his mother was a slave~ When Ning Guo was at war, the Marquis asked him to join the army for his younger brother. He thought he would die on the battlefield, but he didn't expect that on the battlefield, he would use modern knowledge to defeat the enemy many times, destroy all directions, and make military exploits many times! Su Qin returned five years later and had already become a border guard general! I thought that his parents, who looked down on him and never loved him, would change this time. Unexpectedly, his parents asked him to disappear and remain anonymous. Let him give all his military exploits and glory to his younger brother Su Mufeng! Why? Is my brother's life important? His life is not his life? This time, Su Qin will no longer compromise!