Medicine Boy: from Delivery Guy to Master of Herbs

On the wall of a cave in Zhongnan Mountain, there is a line of ancient characters that no one can recognize. Lin Ji only recognized one of them - "medicine". The word "Cao" falls to the left. He stared at it for a long time: he had been writing this character in capital letters since he was a child, and the initials of the cursive character were also tilted to the left. Three days later, he reached out and touched the luminous roots, and when he woke up again, it was Chang'an in 705 AD. He borrowed a ray of soul and became the sixteen-year-old apprentice in Ji Ren Hall - Ji'er. Medicine in other people's eyes is dumb. The medicine in his eyes can speak - just look at his complexion and the medicine will give him a reaction, as simple as saying hello to an old acquaintance. He can cure the disease here well. He could also see what was going to happen in the future: Shenlong, Tang Long, Xiantian, and then the peace of the forty years of Kaiyuan. He didn't dare to think about it further. But he couldn't say a word. He could only grab the medicine, seal it with wax, determine the portion, establish rules, write "three ounces of honey" into the pharmacopoeia, and say "drink more hot water" to every patient. From the age of sixteen to two hundred, he sent away his master, his wife, five disciples, and an entire prosperous age. And why is there traces of himself everywhere in the world he desperately wants to return to?