Lin Zhou, a senior Internet product in the 21st century, traveled back in time to the 1990s due to overwork and became a technician at a state-owned electrical appliance factory on the verge of bankruptcy in a small southern town. He uses his grasp of business logic that transcends the times to accurately predict consumer trends; he is good at using "product thinking" to transform traditional products and design marketing plans; he has the ability to learn quickly and adapt to the times. From the initial utilitarian who just wanted to "make quick money and return to the modern era", he was gradually moved by the warmth of humanity and the enthusiasm of entrepreneurs in the 1990s, and finally took root in the era and became a "wave leader" in promoting the upgrading of local industries, realizing the transformation from "self-interest" to "altruism".