The True and False Crown Prince: Claiming the Throne with a False Identity

[No other choice: I'll have to conquer the realm with my face] After working himself to death from overtime, Zhang Heng transmigrated and opened his eyes just in time to catch the Crown Prince and a consort in an illicit affair!!! As fate would have it, he had a face almost identical to the Crown Prince's, so he was made a scapegoat and a sacrificial pawn. Meanwhile, the Northern Shuo cavalry stood at the gates, and the Great Qian dynasty was on the brink of collapse. The cowardly Crown Prince couldn't hold on to the throne, but Zhang Heng saw a path to greatness in his role as a stand-in! With the Eastern Palace's golden token in hand and the Crown Prince's face as his blade, he would rally the last elite cavalry in the realm and turn his fake identity as Crown Prince into the throne of the true Son of Heaven!