Tang Dynasty: Starting by Saving Empress Zhangsun

In the seventh year of Zhenguan, Li Xiaren, the eldest legitimate son of Duke Wei Li Jing, comes of age at fifteen and awakens a daily sign-in system! Signing in grants immortal techniques and unlocks futuristic black technology. Just then, Empress Zhangsun's asthma becomes critical, and the imperial physicians are helpless. Li Xiaren steps in and saves the empress with immortal medical skills. At the palace banquet, he speaks bluntly about the harms of consanguineous marriage and single-handedly annuls Princess Changle's betrothal. Li Shimin jokingly says that if he can cure Princess Runan, he will marry both daughters to him. When Runan recovers, the emperor's golden words cannot be taken back. The youth with extraordinary skills stirs up the winds and clouds of the Tang Dynasty, with two princesses falling for him, while the court and noble families launch attacks one after another. — Description from novelcodex.orgFull novel: Tang Dynasty: Starting by Saving Empress Zhangsun — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠