Qin Dynasty: Who offended my frail and sickly minister?

Zhou Wenqing never intended to alter the course of history, but an unexpected transmigration into the chaotic Warring States period left him with little choice. Awakening severely injured and stranded in a hostile era, he quickly discovers that the body he now inhabits belongs to a spy dispatched by the State of Han to infiltrate the State of Qin. Armed with a system that offers minimal assistance, Zhou Wenqing repeatedly attempts reckless methods to return home, only to be thwarted by one unforeseen accident after another. Resigned to his fate, he decides that survival is his only remaining option. Despite his frail constitution and initial reluctance to stir up trouble, circumstances continually drag him into the political heart of the Qin State. Without realizing how it happened, he finds himself deeply entangled with its most powerful figures. King Ying Zheng of Qin dotes on him as an invaluable minister, fiercely demanding to know who has upset him today and threatening to exterminate entire families to protect his health. Meanwhile, Prince Fusu reverently looks up to him as his esteemed teacher. Bound by loyalty and burdened by sickness, Zhou Wenqing must navigate deadly court intrigue without ever intending to become its center.