[Tang Dynasty] Elder Sister-in-Law of Li Shimin

An overworked 996 office drone transmigrates to the Sui and Tang dynasties, where food and drink are plentiful, and becomes Zheng Guanyin, a highborn legitimate daughter. The good news: Her fiance, Li Jiancheng, is young, handsome, and devoted. Her future father-in-law, Li Yuan, is about to become emperor. Her younger brother-in-law, Li Shimin, will one day be honored as the Heavenly Qaghan by the surrounding steppe tribes. The bad news: She remembers a drama called the Xuanwu Gate Incident, in which her handsome fiance and her younger brother-in-law Li Shimin seem to have a falling-out-- Zheng Guanyin decides to teach her future husband all about lying flat and living a healthy life. Who knew that rare treasures would keep appearing in the Duke of Tang's mansion? Distilled liquor is one thing, but what are rice-flower cakes and pearl milk tea? Zheng Guanyin timidly says, "The king of heaven covers the earth tiger..." The transmigrated Li Jiancheng jolts. "You're a fellow transmigrator!" On their wedding day, Li Jiancheng asks Zheng Guanyin what she wants. Zheng Guanyin: "I've had too much puffed rice. I want popcorn..." Li Jiancheng: "Corn is in the Americas next door. I'll have my brother Shimin conquer it too." Reader's guide: Both the hero and heroine transmigrate. Everyone else is a native. Theme: Technology changes the future.