The Empress Comes Looking for Me with Her Child: I Reincarnated as Li Jiancheng

My name is Huang Jingxing. I'm 20 years old and a medical student. After an accident on an outing, I was chosen by the System and transmigrated into the body of Li Jiancheng, the hidden crown prince of the Tang Dynasty. I lived through the Xuanwu Gate Incident and was shot dead. After completing my mission, I returned to the modern world. But when I woke up, the 20-year-old Princess of Qin, Sun Wugou, was standing in front of me with a pregnant belly, calling me "honey." A System error had brought her along when I transmigrated, and it had even given her an ID card, a student record, and one hundred million in compensation. The portal was closed, and there was no going back. She recognized me, and I couldn't deny our marriage spanning a thousand years. Now I have to raise an empress, take care of a child, go to school, and work as a doctor, all while keeping it secret from my parents and the whole world. It's hell-level difficulty from the start, but I can't back down.