Fake Eunuch: From the Start, I Kidnapped the Empress

Just after transmigrating, Yang Shengxiu is nearly killed by a single slap along the way. Fortunately, an old eunuch saves him and takes him back to the imperial palace, where he treats him like his own son and teaches him everything he knows. After the old eunuch dies, Yang Shengxiu thinks he is destined to spend a long, dull life as a eunuch. Then he unexpectedly gets bound to a ridiculously awful System called the Death-Seeking Challenge! [The System issues a nightmare-level challenge: Kidnap Emperor Liang Ren! Reward: the martial art Northern Darkness Divine Skill and a hundred years of internal energy poured into you!] Oh! The emperor is actually a woman? What? She wants to kill me too? Yang Shengxiu says, Don't panic. Everything is under my control! Your Majesty, you wouldn't want anyone else to find out that you're a woman, would you?