Reborn + No System + Ancient-Era Officialdom + No Female Lead + Decisive and Ruthless + Disguises + Fighting for the People
(Not your typical wish-fulfillment novel. It takes some creative liberties, so it may catch some readers off guard.)
Are we all destined to become the very people we once hated? Chen Zhichen, reborn with knowledge of the future, knows a great many things. But when he realizes that living as his former self still won't let him thrive, he chooses betrayal: betraying himself and the future, becoming someone else and walking another man's path, leaving that man with nowhere to go.
So he becomes his own enemy, marries the girl who loves him, takes his revenge, seizes military power, and gains control of Jiangnan. He even makes the master of Jiangbei, his own former master from before his rebirth, kneel at his feet and beg for mercy.
Looking down at the man beneath him, he realizes that once you become the victor and win everyone's support, no one cares who you are or what you look like, because a god has no form.
Just as he understands this and prepares to kill the man at his feet, someone blocks his sword and reaches out a hand to the man...