Fairy, Don't Be Afraid, I'm Really Your Husband

After transmigrating into a game, Su Yu became the double of a powerful official. From the start, he nearly got castrated, but he successfully killed his attacker and stole his identity, thanks to their identical appearance. He had planned to keep his head down and live a quiet life, but then he discovered that he was actually a spy from an enemy kingdom... Su Yu: Sorry, but to stay alive, I have no choice but to pursue the empress! Empress: Su Yu, what are you doing? How dare you overstep your station! This is a crime of deceiving the throne!!! [PS: This is not a traditional eunuch-from-the-start story, and it doesn't follow the usual tropes. Give it a try!]